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The Vampyres' Source: The Complete Series

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A thrall is supposed to be a grateful, willing servant, and constant source for their Vampyre Lord.

I am not willing and I despise being in his presence.

The days have blurred together ever since he forced his blood down my throat.

This is supposed to be illegal in society, but the laws don’t apply to the Vampyre King.

It doesn’t matter how much I fight him off and refuse to bend to his will despite his blood running through my veins–it only makes him want me more.

Apparently I’m an anomaly. No one has ever refused the call of a Vampyre’s blood.

I try to keep my hope alive that someone will step in and right the wrongs of my injustice…But no one does.

There’s nothing I can do to escape this misery.

I’m paraded around in front of the King’s Lords at a banquet, freely offered as a source to whoever wants a taste.

Until Vampyre Lords from distant lands threaten a war for my release from captivity. While I should fear them, I find myself drawn to them instead.

They light the spark of hope within my soul that I thought was long extinguished.

Perhaps this isn’t always how my life will be.

Perhaps I’ll find my freedom.

Kindle Edition

Published May 1, 2025

32 people are currently reading
29 people want to read

About the author

R.L. Caulder

45 books1,541 followers
R.L. Caulder is a USA Today bestselling author who lives in her writing cave away from the intense heat of the Florida sun with her husband and furry writing assistants, MeowMeow and Winrey. Life is never boring for R.L., who has hundreds of imaginary friends constantly vying for her attention and begging for their stories to be told.

If you're looking for ways to interact with R.L., you can find her on Facebook, in her group:
The Cauldron: R.L. Caulder Reader Group

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Displaying 1 - 30 of 43 reviews
Profile Image for Mariah Mcginn.
17 reviews7 followers
June 17, 2025
Amazing read <3 instalove - yes, strong fmc - check, dirty talking MMC's who are super protective of their girl. plot twists that had me laughing and breaking my heart in equal measure as well. The development of all the characters and the slow development of friendships kept me hooked through the read as well as action and spicey scenes.The ending was not one I could have ever expected but happy with the outcome <3
Profile Image for Candice.
77 reviews
June 3, 2025
Ruthless Blood
I freaking love collaborations between RL Caulder and M Sinclair! It’s almost guaranteed to be awesome, and, of course, it totally was.
I’m liking this new vampire world and can’t wait for more information about it. I love that Kyella is kind of bad butt from the beginning, even if she has a few weak moments, because let’s face it we all have those too. I like the way the relationships between her and her men evolved throughout, even if one of them was being frustrating for a minute. Then, when you add in the tension and spice factor that builds from the beginning, it equals a must read! You won’t regret it.

Ruthless War
A great part 2! This book starts off right where the last left off, with Kyella still held on the ship.
I love that this book kept me guessing throughout, and there was even a moment my jaw dropped with the unexpected. It started with the continuing action from book one, but it did have a bit of a lull in the middle before it started up again. This allowed us to take a deeper look into their relationships though, and to be able to see how they grow together with everything going on around them, which I liked.
Overall, this was pretty good and a great continuation from book one.

Ruthless Love
A fabulous conclusion to a wonderful series! I’m sad to see it end, but am so glad to have gone on the journey with Kyella and her men as she becomes who she’s meant to be. Despite the all challenges thrown her way Kyella overcomes and rises above, and what more could we want in a heroine. I loved seeing the relationships grow between not only Kyella and her mates, but also her chosen family. Over all, it was a great story filled with lots of action, and tear jerking moments to keep you sucked in from beginning to end. Im glad I read it, and you will be too! ❤️
Profile Image for Shannon - a.court.of.fantasies.
282 reviews18 followers
June 21, 2025
So excited to see the Vampyres’ Source series in one easily accessible omnibus version!!!

Ruthless Blood:
A new universe from M. Sinclair & R. L. Caulder full of mystery, intrigue, and of course hunky men 😍. Kyella is a strong willful individual who is determined to beat the situation she’s found herself in but luckily she doesn’t have to do it alone. With an instant connection and spicy interactions Kyella’s story is full of surprises with twists and turns. I am deeply intrigued by the world building presented here and if you love vampires you will easily love Ruthless Blood! I am excited to learn more about the Empires and their vast lands/history while fighting off the enemies. Easy to read and excitement from the anticipation of what’s to come I am looking forward to part two in this rapid release series!

Ruthless War:
Ruthless war picks up immediately after book 1 and it does not lose momentum! I flew through this book because it was so hard to put down. You can feel the tension and suspense building as you progress in the story and I have a feeling it will be a glorious explosion in the final installment. There is action, spice, romance and suspense to please all types of readers and I thoroughly enjoy the medieval setting this universe puts us in.

Ruthless Love:
What a wild ride!! I laughed and I got emotional and was so sad to say goodbye to Kyella and the guys but their journey through book three was worth it! We had been on an uphill ascent filled with tension and Rutheless Love gives us all the action we were working towards. The spice has reached its peak 🌶 😉 and Kyella as a character has grown so much overall!! She is one of those characters I wish I could continue to follow as she lives her life but will rest easy thanks to the epilogues of this book!
Profile Image for Sue Harbers.
1,357 reviews12 followers
June 3, 2025
Ruthless Blood

I am smitten with this new series! I couldn’t put this book down. Kyella is so strong and a survivor after everything she has endured at the hands of Malakai. She’s instantly drawn to her men even though she doesn’t trust vampires in the slightest. And honestly they give me (ahem, her) life!! They’re everything you’d hope they would be and more! Elijah is a bit prickly but Kolvar and Dakath are so sweet from the start. I love the direction that things are going in for Kyella but the ending scares me! I can’t wait for more!

Ruthless War

Ruthless War was super emotional for me. The things that Kyella endures first physically, but then emotionally, had tears in my eyes. No one but Ky would be able to both endure and rise up after what’s happened to her. But by the end of this book we see that she has taken control of her destiny and is starting to finally believe in herself and that is no small feat. The guys are supportive and protective and basically everything that Ky needs in her life. Their bond only solidifies further in this book. Things are brought to a head by the end of book 2 and I’ll be waiting patiently (sort of) to find out what justice will be served in book 3 and what price will be paid for it.

Ruthless Love

This was the perfect ending to Kyella’s story! It has everything in it; a ton of action, twists and turns, romance, love, loss and hope. Kyella had made one heck of a character arc in this series, going from a thrall who believes herself to be human to an empress who leads her nation into war to fight for fairness and equality. Stellar trilogy!!
Profile Image for Gab.
340 reviews18 followers
June 19, 2025
RL Caulder and M Sinclair are UNMATCHED duo. If you haven't read their collaborations, drop everything you're doing, and read them all. Seriously.

Ruthless Blood
Kyella from the start shows us an independence that I love in a FMC. She has her own sense of personality but also a sense of preservation that keeps her alive. I like that she's flawed and had moments of weakness that proved she couldn't do it all on her own. And her men?? Don't get me started on them. Don't get me STARTEDDD. The tension was TENSE. Also the ending? I personally would have sold my soul for the second book if I had to wait for it.

Ruthless War
This book put me through the wringer. Kyella really went through it. Emotionally, physically, mentally. It felt like I was going through it with her with how well RL and M write. You'd think after everything that happens, Kyella would break, but our girl is strong and unbelievably brave and she rises to the occasion and is a bad ass. With the support of her men, she's brand new and everything sort of just intestifies by the end of book 2. Kyella's believing in herself, her guys are more protective, and book 3 is gearing up to be THE book.

Ruthless Love
There's so much action in this book I had to take a step back to catch my breath. It's the ending of Kyella's story and might I say it's quite perfect. While there is loss in this book, I think it wraps up her story and journey neatly. Kyella grows so fucking much in this series it's so emotional to read along to. I love her and her men so much and I know for a fact this will be one of my go to re-read series in the coming years!
348 reviews3 followers
June 21, 2025
First I want to say how wonderful it is to have the whole story all together, not having to wait for the next part. Not have to wring my hands wondering how long it will take. Kyella has been held since Malakai had killed her family and bought her to the castle. All Kyella wanted was her freedom. At first Kyella tried to survive by trying to stay in the back ground as she grew older she no longer could do that. Then one day she was helped to escaped and she was taken to a new land. One of peace and harmony she begins to see what she wants in life. Little did she know her life was to take an unexpected turn. Come along and see how Kyella, the men in her life, an Empress that became a mentor to her, how she became more than she ever dreamed. So, you think that is it oh no, you have to read to see the cruel betrayal, and the hard-fought changes, and the war that lead to another cruel lose. The men in Kyella’s life could they learn to accept each other? What of changes that needed to be made? We all know that change in oneself is extremely hard, could this be done? The complexity of the character as they develop will not disappoint. How will Kyella do what needs to be done? What will she do when she finally learns the truth? What of the children? Hopefully as the story answer the questions for you there are two characters I hope maybe we will see a book on how they develop. You will not be disappointed in this complex story with many layers to keep you on your toes. Vampires, magic, old gods, monsters, evil evil persons, oh my goodness what more can you ask for!
Profile Image for Heather.
180 reviews6 followers
May 11, 2025
Wow—what an incredible series from start to finish! I absolutely loved every moment of this journey. From the very beginning, Kyella captured my heart. Her transformation over the course of the series is powerful and inspiring—she grows so much, both in strength and confidence. I was fully invested in her story and her relationships with the vampire lords, who each brought something special to the table. I have to admit, Elijah stole my heart—his growth throughout the story and his grumpy demeanor made him my favorite!

Each book in this series builds beautifully on the last. The second book picks up right where the first left off, delivering action and emotional intensity from the very first page. I loved seeing Ky and her guys grow even closer as they faced new dangers and unexpected twists together. The pacing was perfect, and just when I thought I knew what would happen, the story surprised me again.

The final book was an epic conclusion. Kyella and her men crossing the cursed divide to face Malakai felt like a true hero’s journey. There were emotional highs and lows, but the adventure was unforgettable. Saying goodbye to these characters and this world was bittersweet, but the ending left me feeling complete and satisfied.

This is one of those series that pulls you in and doesn’t let go. If you love strong heroines, emotional bonds, high-stakes fantasy, and just the right amount of romance, I highly recommend diving into this series. You won’t regret it!
Profile Image for Rachel Stephens.
2,111 reviews36 followers
June 10, 2025
Anytime these two authors write together, I know it's gonna be incredible! The Vampires Source is a perfect example! The best part, all 3 books in 1!!!

Ruthless Blood
We're introduced to or FMC, Kyella, and learn a little about her. As well as her potential love interests.
There was some action, emotional moments, and spice. Mostly, I think this book was set up to be a good foundation of the world and characters. So far, I'm loving it!

Ruthless War
This picked up right away following the cliffhanger from book 1.
There was action, danger, and a few twists and turns I didn't expect.
We also see more character growth in Kyella. As well as the growth in the relationships between her and the men.
I think this was a great continuation overall.

Ruthless War
The ending to Kyella's story... what an ending it was!! I loved it!
The authors did such a great job tying everything together and giving us a fantastic ending!
Of course it was still filled with danger, action, and a few twists. There were still emotional moments, humor, and spice. Most importantly, Kyella and her men get an ending they deserve!
Profile Image for Lauren Taylor.
46 reviews
June 15, 2025
Let me just start by saying that this is an absolute EPIC series. Anything by these 2 authors is absolutely worth the read! Now, this series has it all. Love, betrayal, heartbreak, twists and turns and the spice is *chefs kiss* perfect! Kyella is a strong, independent and absolute bad (you know what) and refuses to take anything lying down. Her character is so beautifully written and the growth is amazing. Of course she has to collect her harem, she doesn't need protection because shes got her own back, but whats the harm of adding a deliciously sexy man, or more 😉. Kyella goes through so much in these 3 books, she goes from being a Thrall to standing up for whats right and becoming everything youd hope she'd be. The world building is absolutely amazing and you will nearly break your fingers trying to turn that next page! Oh and let's not forget the sass. There is absolutely nothing better than a sassy heroine! Dont just take my word for it, get this book today and start the Journey of Kyella finding her way to who she truly is, and all the *fun* she has in between
Profile Image for Michelle Reuss.
415 reviews8 followers
June 20, 2025
Enjoyed it

I read these books separately, so I will put my reviews I wrote for each individual book.

Book #1 Ruthless Blood
I enjoyed this book. These 2 authors are among my favorite RH writers, and I have enjoyed everything they write. I like Kyella, and I can't wait to find out more about the guys.

Book #2 Ruthless War
I enjoyed this book. It started off right where the 1st book ended. There was a lot going on in this book. I felt every single emotion with this one. The last part had me crying, and I had to take a little break until I started the 3rd book. I love these authors so much and will read anything they write.

Book#3 Ruthless Love
This book had me all up in my feelings. I cried, I laughed, and I gasped. This series was fun to read, and I think it ended beautifully. The characters, especially the fmc Kyella, went through so much and came out stronger on the other side. While I wish a few things had been different, I really enjoyed this book.
Profile Image for Amy.
1,387 reviews3 followers
June 23, 2025


All three books were amazing . They have everything from action great world building and amazing characters.

This book rocked! To be a prisoner since Kyellas family was unalived pretty much was horrible. Kyella was the emperors thrall , during her punishment she met 3 hot men. From there all the fun begins, kyella finds out about herself and has dalliances with those men who rescue her. Just as all goes well …I reached the cliffy now I am anxiously awaiting the next book. To see what happens next. I can’t wait !

Kyella is made of some tough stuff , she is awesome. She was able to escape her torture. Returning to her three men with loads of steamy scenes and undying love. Something tragic occurs and well she is going to war and I can’t wait to see what happens at the end of this gripping series


Loved the ending of this series! Kyella is truly a kind hearted awesome empress. After all the heart ache and loss through the war, she finally one and got a great hea. I’ll definitely miss reading about her and her mates and all the steamy scenes. Definitely a great read!
Profile Image for Andrea Gorrie.
247 reviews2 followers
June 10, 2025
Good versus Evil with a Vampyre Twist!

Take one oppressed FMC with a secret, one evil vampyre emperor and three very sexy lords and you end up with an epic series of good versus evil with a vampyre twist. I Ruthless Blood we are introduced to Kyella, the very evil Malakai and some sexy lords Elijah, Kolvar and Dakath. By the end of book one in the series we really see what Kyella is made of. In Ruthless War, she’s now a force to be reckoned with. While she has her lords, she doesn’t need them to be a strong bad a** woman. In Ruthless Love the final book in the series I was both happy and in tears. I love how the series ended, but there was plenty of heartache along the way. This series is actioned filled with plenty of heat and the characters and world are spectacular. Perfect summer read!
Profile Image for Mary Rose.
826 reviews52 followers
June 14, 2025
Kyella's character arc from the first book to the final book is insane. It’s one of the best I've ever read because we saw a gradual, steady build up; it didn't just happen after a few pages. Her strength and confidence bloomed over the series. She's probably one of my all time favorite fmcs. I loved how not only her fellas grew to love her, but an entire kingdom. She faced every challenge with tenacity and allowed her actions to be based in love. For her guys, her people, and in a way, herself. As she was growing and adapting to her environment, she learned to be comfortable in who she was. Her dedication to make the world a better place for all of them won over everyone, and she led by example not by decree. This is a great series! And that epilogue left me desperately wanting the next story…
283 reviews3 followers
June 3, 2025
I flew through this omnibus! M. Sinclair and R.L. Caulder really are a match made in heaven - they can never go wrong. I loved the characters - they were so well developed! Our FMC and her guys steadily grow closer throughout the books, including our grumpy, stubborn ones! Kyella herself gains confidence and strength as she learns more about herself and prepares herself for what’s to come. There is so much action throughout this series, but the emotion involved is what really keeps you glued to the page. You can’t help but love each character and want to see them triumph. Overall, I loved each book and if you want vampyres, empires at war, a strong FMC, and men who are devoted to her, then I definitely recommend!
Profile Image for Jessica.
7 reviews
June 6, 2025
I don't know how I hadn't read this series before now but I'm both sorry that it took me so long to and happy that I only just got to discover these characters and this story. From the moment you start reading you can't help but love Kyella (and even want to be her despite her circumstances). If you are looking for a badass FMC, Kyella is who you want. The three men - Elijah, Dakath and Kolvar - are all swwon worthy in their own ways and I loved getting to know them individually as well as alongside Kyella. None of the supporting characters felt unnecessary and all added to the story in their own way. I would've liked a few more chapters in the last book before the epilogues, but overall felt this series was well written and gave you closure whilst still wanting more.
Profile Image for Kendra Carter.
14 reviews
June 8, 2025

Though this is not my top favorite calibration of M. Sinclair and R. L. Caulder, it’s definitely worth the read. I found this to be a good causal read for me (as in I could still function and not have to binge read). This is a short 3 book series that had compassionate lead characters and a fitting villain. I enjoyed seeing how the characters grew and evolved into who they were meant to be. I’m hoping there will be more of them in others books. I highly recommend adding this to your reading list, as well as the other books M. Sinclair and R. L. Caulder have written together.

Best wishes and happy reading my lovely fellow book dragons 💕

Profile Image for Amber Adams.
179 reviews10 followers
June 27, 2025
Kyella, the FMC, is fearless, and determined. She has moments of vulnerability, but she's not going to let that stop her from bulldozing ahead to accomplish what she wants.
Elijah, Kolvar, and Dakath, the MMCs, are fantastic. Kovlar and Dakath are sweet and immediately take to Kyella, while Elijah is pretty sour towards her.

The things Kyella has to cope with is heartbreaking, but she holds on. The spiciness was perfect! The relationships with the MMCs was great, and enjoyed all of it. The pace was solid, and I had gone through all of the emotions by the end of the book.

Absolutely recommend.
Profile Image for Caylee T..
855 reviews11 followers
June 19, 2025
I absolutely loved this series! I am a huge fan of both authors & was so happy to have read it.

Kyella’s story was full of pain & suffering but also hope & redemption. The fact that her life for the past few years have been absolutely horrible, broke my heart for her. But then someone believes she deserves better & helps her escape. But also with the help of three Lords who feel an immediate connection to her. And I absolutely loved the fact that they had an instant pull to her.

From there, her story takes off with an adventure that has so many ups and downs and twists, it all will leave you in awe of how it was all written.

And when she starts to learn more about herself, I was not expecting the outcome but also so excited for her. She will finally be able to gain some of her power back.

And in this time, she also connects more with the three Lords that have made her feel safe & special.

She faces so many different hardships & tests of her ability & strength that definitely had me rooting for her the whole way through.

On top of the trials, she faces immense heartbreak that absolutely gutted me.

This whole series had me in a chokehold & I couldn’t put it down. I absolutely fell in love with Kyella & her men. And that epilogue that showed their future was downright adorable.

This was an amazing series. Absolutely amazing job!
Profile Image for Mandy Sadler.
176 reviews1 follower
June 11, 2025
Wow!! This book absolutely blew me away! Kyella is a total badass—full of fire, sass, and strength. After everything she’s been through, the fact that she still holds onto her heart is amazing. She never gives up, even when the odds are stacked against her. Her men? Absolutely delicious!!!
I laughed, I cried, I swooned, and I even got chills. The emotional rollercoaster was real, with so many moments that had me feeling everything all at once. And that ending? Insane, intense, and completely unforgettable!
Profile Image for Sarah .
508 reviews6 followers
June 10, 2025
This was such a great series and I am so excited they have been wrapped up into one omnibus. Below are my reviews for each book! They definitely all got 5 stars from me.

Book 1 review: M Sinclair and RL Caulder teaming up always makes for a great book and this case is no different. If you are looking for a clever and kind FMC who has no idea how powerful she is, 3 book boyfriends who will do anything for her (even if some struggle to admit it) and lots of suspense....this is your book! I can't wait for the second book!

Book 2 review: Oh this book brought out all the feels. Ky's journey comes so far in this book and she really begins to understand her powers and her self worth a lot better. I will say that rarely does a book make me cry out of sadness and happiness and yet this one accomplished that beautiful feat. It really was a great book.

Book 3 review: I feel like in this book we truly got to watch Kyella grow in her new role and learn to become everything that entails. Between that and watching her men accept her new role and adjust so wonderfully to that changing dynamic as they try to change the world, this book felt empowering. After everything they have been through together, this HEA was so well deserved and we even get a glimpse of a possible future spin off for the future!!
Profile Image for Natalie N.
102 reviews
June 5, 2025
Great series from beginning to end!

This series has it all, great world building, a few hot men and action.

Kyella started off as a prisoner in a way, and fought her way through for freedom from an abusive past. Along the way she met each of her men who would help her become stronger!
Great chemistry between her and the guys!

This series is a must for people who love possessive alpha males, steam and amazing story line.
867 reviews3 followers
June 6, 2025
R.L. and M. give us an absolutely fantastic series! The story of Kyella and her vampire lords as they fight for freedom and their lives and the removal of the Thracian Emperor Malakai, will keep you guessing and turning pages throughout this beautifully written book with complex characters and plot twists that you don't see coming. I loved reading this story and highly recommend it. Don't miss out on this book!!
1,714 reviews7 followers
June 6, 2025
This series definitely had me hooked. I love strong FMC and men that support their character. A human used as a blood slave to an emperor and men that will support her through the challenges. We get a very spellbinding world that will just have you reading this from start to finish. I love the concept of magic and other elements we discover throughout the series. It's definitely one of my favorite series so you must pick up and dive in.
Profile Image for Payton.
284 reviews4 followers
June 18, 2025
so good

I mean come on. I was hooked once I got started. I needed to keep flipping the pages because I had to know what happened next. I went through a wide range of emotions while reading this. I genuinely enjoyed the growth of the characters. Another solid read for me from the lovely RL Caulder and M Sinclair. You are def one of my must reads and I’m so mad I missed these the first time around but am sooooo glad they’re in omnibus form.
340 reviews1 follower
June 19, 2025
I was a huge fan of this series when it was published individually. So throw them all together with some bonus scenes, and just take my money. Plus, these are two of my must buy authors so of course I needed bonus scenes. Kyella was one of my favorite heroines, she was a hard core bad mama-jamma. Throw in her dirty talking men and of course you want this book. The bonus scenes were a great touch as I loved this story the first time around, but reading something new is always fun.
141 reviews1 follower
June 19, 2025
loved it

M Sinclair and RL Caulder always kill it with the cowrites. They combine their voices and writing styles so well you can’t even tell two different people wrote it. This is a series I absolutely loved the first time I read it and enjoyed just as much on my reread when the omnibus came out. They build worlds and characters so well and pace their stories perfectly. Definitely recommend.
Profile Image for BookishlyBroken.
82 reviews6 followers
June 23, 2025
Anything written by these two are always on my must read list, they never fail to disappoint and keep me immersed in the story and wanting more. Like always their men are to die for and their FMC is a strong badass who goes through so many ups and downs but comes out stronger. This book will make you feel all the emotions from laughing one minute to crying the next, it truly was exceptional. A must read in my mind
Profile Image for Jenn (loves_a_good_book).
132 reviews10 followers
June 11, 2025
This was a great series. The world building and plot was amazing. Tons of action, twists, heartbreak, love and spice! I love a MFC who can rise and be the best she can be. She also has three men who are dreamy and support her throughout everything. A story of humans and vampyres, fighting for freedom and a destiny they all deserve. Definitely recommend!
Profile Image for Davina Meyer.
11 reviews1 follower
June 18, 2025
Such an amazing series I always come back to it when I’m in a book funk. If you’re looking for something that’s gonna keep your attention throughout the entire book this is it. The world building is amazing and it’s really neat to see how they take a regular myth and twist it to fit the series. I completely recommend this series and anyone who reads it is gonna know exactly why!!!
Profile Image for Tiffany.
529 reviews8 followers
June 21, 2025
I was beyond excited to see this series combined into an omnibus. This series is SO good. We have Kyella with her men Elijah, Kolvar, and Dakath. This storyline is intriguing with plenty of action that leaves you on the edge of your seat. The spice in this...delicious. if you love paranormal romance and vampires this one is for you!
Displaying 1 - 30 of 43 reviews

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