The Four Treasures Saga [Isekai / LitRPG]

Self-Published

Community Rating

Description

Welcome to the birthplace of The Four Treasures Saga. You can read book 1, Children of the Cold Moon, for free here and onPatreon. I've had to stub Book 2, The Breaking of Annwn, here on Royal Road due to Amazon's Kindle Unlimited exclusivity requirements. However, you can view early drafts of Book 2 onPatreon. Please let me know if you didn't get a chance to finish it. Please support the work I'm doing by favoriting and following this series (or possiblybuying it). It would mean the world to me. And check out our website and the reader's compendium below CHECK OUT OUR WEBSITE - - - BOOK ONE: CHILDREN OF THE COLD MOON On the winter solstice Bren gets pulled into the Celtic Otherworld, where he uncovers a grave threat looming over the world. Armed with ancient magic and guided by legendary figures from Celtic mythology, Bren embarks on a perilous quest to retrieve relics said to hold the key to restoring balance. But as he delves deeper into the mysteries of his own identity and confronts the shadows of his past, Bren realizes that his journey is not just about saving the Otherworld— it's about discovering the hero within himself. - - - BOOK TWO: THE BREAKING OF ANNWN After uncovering the truth about his origins, Bren begins a desperate effort to rally the scattered forces of the Celtic Otherworld against the Overking. But he’s not the only one preparing for war. Across Annwn, Bren's fierce fairy ally Fíadan, his Fomorian brother Cai, and the conflicted noble Tadg, each pursue their own paths toward a shared destiny. As new alliances form and ancient powers stir, the group journeys through wild and wondrous corners of Annwn—where strange fae, forgotten gods, and dangerous magic await. Old friends return. New enemies rise. And the cost of failure grows heavier with each passing day. When the final clash erupts, it won’t just decide the fate of a kingdom— it will reshape the very land they fight for. - - - © Copyright 2026 The Longwinded OneAll Rights Reserved No permission is given by the author to reproduce, translate, create audio formats, or repost on other sites or distribute.

Information

Status: Ongoing
Year: 2024
Author: longwindedone1

Royal Road Stats

Rating: 4.7/ 5.0
Followers: 690
Views: 130,538

Chapters(77 total)

What readers say about The Four Treasures Saga [Isekai / LitRPG]

“I went through the book faster than I would have expected. Turning pages is very rewarding; the author keeps you wanting to learn more. STORY The Four Treasures Saga is a carefully thought out fantasy, well paced, and with likeable characters. It shows that…”
Alan KurtRoyal Road5.0 / 5
“Children of the Cold Moon is a captivating blend of fantasy and adventure. The author skillfully weaves together elements of Celtic mythology to create a rich and immersive world. The world-building is impressive, with a detailed and believable world that f…”
Apollo149Royal Road5.0 / 5

Reviews

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Community Reviews(10)

Alan KurtRoyal Road
★★★★★ 5.0
I went through the book faster than I would have expected. Turning pages is very rewarding; the author keeps you wanting to learn more.
STORY
The Four Treasures Saga is a carefully thought out fantasy, well paced, and with likeable characters. It shows that the author has meticulously crafted the scenes, the personalities and reactions, and the world. By the way, the world is vast and full of intricate lore. The pacing is great and it does not lose the tone. There is always this sense of urgency that moves you forward in the story.
STYLE
The style is that of a classic fantasy and it feels familiar and cozy. I also appreciate that is is humorous at times (thanks to the Fairy Fí), and it has an overall positive upbeat, mostly carried by the character Morias. It's a style that calls you back to read it.
The world brims with life that you're looking forward to explore with the main characters. There are many species of creatures and factions, all with their own quirks and goals.
GRAMMAR
The writing and grammar are smooth and there are no mistakes. The sentences flow quite nicely and in action scenes you can perfectly imagine what is going on. The editing must have gone through several review rounds; more indication of the author's care for his story.
CHARACTERS
The main character is the perfect vehicle for the reader to learn about the world progressively. He has a "save the cat" moment early on, so it's easy to root for him. Morias is the father figure of the story, the mentor, and I believe this character is what makes the story "cozy". The fairy ads the edge to their interactions and the action early on. The knight Tadg provides with tension, the drama that tests the unlikely group.
The The Four Treasures Saga is an epic fantasy that delivers what a fan of the genre expects and more. The world is immense, the characters have unique voices, and the story is gripping. I give it five well-deserved stars.
Apollo149Royal Road
★★★★★ 5.0
Children of the Cold Moon is a captivating blend of fantasy and adventure. The author skillfully weaves together elements of Celtic mythology to create a rich and immersive world.
The world-building is impressive, with a detailed and believable world that feels both familiar and fantastical. The characters are well-developed, with compelling backstories and motivations. Bren, the protagonist, is a relatable and engaging character who undergoes a significant transformation throughout the story.
The pacing is well-balanced, with both slow-burn character development and fast-paced action sequences. The author's writing style is engaging, with vivid descriptions and well-crafted dialogue. The magic system is both intriguing and well-integrated into the story.
The action sequences in the book are particularly well-executed, with thrilling sword fights and magical duels that will keep readers on the edge of their seats.
The style and flow of the writing are exceptional. The author's ability to create vivid imagery and captivating dialogue is evident on every page. The prose is polished and professional, making for a truly enjoyable reading experience.
This is a promising start to a series. The author's ability to create a captivating world and compelling characters makes Children of the Cold Moon a must-read for fans of fantasy.
BeezeRoyal Road
★★★★★ 5.0
This story is enjoyable from the start. Now there does seem to be some Celtic history in the mix. Even so, you can still pick it up easily with the writing providing the right combination of both information and action. This is a story that has so much to offer to everyone and I can say it was enjoyable.
Grammar/Style: In terms of Grammar, there's nothing I saw out of place and everything flew by smoothly. The Style of the writing was unique and provides entertaining enhancements to the feel of the story. The System is woven in the beginning as messages at the start which provide information of statistic of the character's progression, though granted it is tied into the story seamlessly, it feels fine and could be explored more heavily later down the line.
Story: The Story is good. In the first half it has the transportation and from then, we have been getting action in this world. The world building is good and you get the feel of the atmosphere around them with how they are described. The Story is both humorous at points, entertaining and can even hold serious moments. The stone in the story and it's power piques my interest and I will probably read some more to see where that goes.
Characters: They were well-done and greatly 'washed' for this world.
Chapter 5. Sorry, I had to.
The Mc came off as down to earth and also in their situations i'm sure some would think the same way. The other characters have their own unique personalities and it feels almost natural the way they communicate with each other.
Overall: I effectively enjoyed it, and I encourage others to read it for a taste of new sparks. You have unique characters and a world setting that can feel alien to those without prior knowledge of the history of the Celtic's, but I am sure many of you look to try something you haven't before, so I would say to give this a go.
Cjbaron92Royal Road
★★★★★ 5.0
Overall: "Children of the Cold Moon" embraces beloved fantasy traditions, drawing inspiration from classics like "The Lord of the Rings" and D&D. However, it sets itself apart with a modern protagonist and a memory-loss mystery, cleverly incorporating isekai elements as Bren transitions from Ériu to Annwn, discovering the magical truths about his past and identity. The Stone of Destiny, with its specific abilities and significance, echoes powerful artifacts from other fantasy stories. Annwn, the realm of magic and eternal youth, immerses us in a captivating fantasy world. I'm curious to see if Bren will visit other realms in future arcs.
Story: The author thoughtfully explores themes of identity, destiny, and the clash between the ordinary and the extraordinary. Through Bren's perspective, readers gain a deep understanding of these themes, making the narrative both engaging and reflective.
Grammar: The dialogue feels natural and authentic, effectively conveying the characters' personalities and relationships. The narrative maintains a consistent voice and tone, enhancing readability and keeping the reader engaged. There are only minor grammatical errors, making for a smooth reading experience.
Character: Bren is a relatable main character whose growth from a confused young man into a figure of potential significance is compelling. The author humanizes Bren through his interactions with Tathan, blending humor, skepticism, and a growing sense of responsibility. Bren's sarcasm and humor ground the story's fantastical elements, making him both relatable and endearing. After finishing a few chapters, I find myself eager to learn more about Tathan's past.
DosilliRoyal Road
★★★★★ 5.0
Review through chapter 6
Story:
Very different, very confusing, but in a beautiful way. The confusion the reader experiecnes is natural, as we follow the Brenn navigate a plethora of new things that are thrown his way in quite the abrupt fashion. We learn as he learns, and so far we've been learning a lot. I'm genuinely excited to keep learning about this new world magic, in a realm where no one ages! P.s we get to see the earlist signs of a conspiracy afoot!
Style:
The author uses people and the surrounds to paint quite the vivid picture. Throwing out terms and concepts that may not be defined fully till a later chapter, bringing clarity to the reader at the most oppurtune time. Without boring the reader with long unnatural info dumps. It's like a puzzle that is slowy yet poetically pieceing itself together.
Characters:
The MC with his memory loss, yet a seemingly all important role to transport a rather extremely valuable relic? I can't to read the growth he will experience. The sage, a man whose age is unknown, he somehow managed to not grow old desspite not being in the immortal realm anymore. The mystery around him is evident. The fairy, with her life bonded blades, the last of there kind, tasked with a duty to deliver brenn and his sage safely. So far the depth each character has shown has been great.
Grammar:
The grammar is great! I don't know if it was because I was locked into the story or not, but I didn't notice anything wrong our amiss. Great stuff.
Overall, the story takes a very different take on being 'transportated to another world', and so far the history that has been organically weaved into the story is already painting a beautiful picture of whats to come. I highly recommed!
FiddlesoupRoyal Road
★★★★★ 5.0
Oh man, where to begin? The world-building is out of sight! It shows a real love and passion for Irish mythology, which is one of my favorite mythologies. It's always fun to read different fantasy interpretations of the Sidhe, and this story knocked it out of the park. What's even cooler is all of the extra content that is out there for this story. There's a compendium, an audio podcast, and more. It is top-of-the-line quality, and it feels surreal that this is something on RR and not an actual published work. 5/5 will read more.
Story: Such an amazing premise for an Isekai. The main character is whisked away to the Celtic Otherworld. Such a brilliant idea for an isekai. The MC has no memory prior to his 18th birthday 4 years ago. His parents mysteriously die and he's brought to his ancestral homeland by his Valet. After coming into contact with Druid stones on a certain day, he's whisked away to the Celtic otherworld where he encounters many different beings from Irish Myths.
Characters: Bren is the MC. Hes 22 or so and can’t remember anything before his 18th birthday. He has a loving but vitriolic relationship with his manservant, Tathan, who appears to be a middle-aged and portly man. Their dynamic is great. There is also a fae named Fí who is definitely my favorite character.
Style: The story is solidly written with great prose and dialogue. It serves the characterization and world-building well. My ADHD sometimes makes me lose focus when reading, and that didn’t happen once here.
Grammar: Everything was well written I think I noticed a few formatting issues in chapter 5 or 6, but nothing that would affect the score or your ability to read.
Jordan Elias R.Royal Road
★★★★★ 5.0
This book is definitely one of the best written on this site from a grammar, style and world building perspective. I have found no big errors whatsoever. The author provides very detailed descriptions of the places in the book which enhances the experience a lot.
In terms of prose, grammar and style, this book excels. The writing is imaginative and very inviting, and I find it easy to get sucked in. Very nice prose. I found myself envisioning the setting very easily.
The story itself is a pretty refreshing take on the litrpg genre, with an impressive progression. it is written in first person, and despite the naivety of the MC in the first few chapters, the author managed to avoid any sort of info dump, even citing the treatise of tedium which was really fully. overall, the story is a beautiful read and I can't wait to do more.
The characters are fun and inviting, especially my favorite, Fi, the three foot fairy whose humor adds a great deal to this beautiful book.
Overall, I would say that this is one of the better stories on this site and I very much recommend it to anyone with a love of fantasy, progression and fairytales.
OneDropRainRoyal Road
★★★★★ 5.0
When our grandparents gathered around the fire to hear stories of creatures slipping out of the forests at night—spiriting away virgins, swapping children for changelings, and weaving all manner of Fey shenanigans—they were, in a way, reaching across generations to recount fragments of this tale.
At its core, the story follows Bren, an ordinary young man abruptly thrown headfirst into a world he knows nothing about. What could have been his doom turns into his first salvation: he stumbles upon a size-shifting weapon that simply rocks, granting him enough power to ward off a hag of winter, allowing him to follow a Fey and a manhandler who dragged him into this mess. From that moment onward, the plot only grows more entangled, more magical, and more otherworldly—in the very best sense of each word.
One of the standout strengths here lies in the characters. Every figure introduced feels fully realized, with their own quirks, unique ways of speaking, and deeply rooted sense of self. The prose adapts fluidly to the needs of the moment: richly evocative when setting the atmosphere, yet sharp, clear, and fast-paced when action ignites on the page.
Language, grammar, and style are flawless throughout.
My only small caveat is that Bren’s entry might have felt smoother if his handler had explained what was coming before the day he was literally isekai’d. But aside from that? The work is simply brilliant.
PathOfPenRoyal Road
★★★★★ 5.0
Setting: Right off the bat, the author does an excellent job transporting us to a forest on one chilly morning, expertly painting the celtic theme they promise in the blurb. From there, it only gets better as we are further immersed into the celtic mythos with the introduction of all sorts of creatures like the fae, the sidh and the giants. If you are a fan of the genre you will definitely enjoy it, and if not, this is the perfect story for you to become a fan :)
System: The LitRPG elements show up early on in the form of magical relics which grant specific powers. Not the generic fireballs and ice lances that are arguably overdone, but really interesting abilities, such as a stone that allows one to shrink or enlarge objects. This already opens the door for all sorts of interesting fights, and I can't wait to see what the story has in store for us.
Characters: It's still too early to truly be attached to any one character in particular, but what I can say is the dialogue flows well and sounds natural. It felt I was watching two real people converse in real life, not reading fiction - despite the bizarre magical elements they were discussing. The only thing left is to see how those characters grow over time.
Language: I'm not sure if the author is a native english speaker, but if not, I wouldn't be able to tell. I haven't spotted any mistakes and everything flows well. The transitions between narration, dialogue and action were smooth and the prose was evocative.
Story: The plot is probably one of the toughest things to judge from a small number of chapters, but I did like what I've read. By the end of chapter 1 we already get an interesting plot twist, and it all gets better from there, as we learn about the world and the stakes involves, while getting to know the protagonist better at the same time.
Overall: Whether you are a fan of the celtic mythos in particular, or just a fan of LitRPGs... or really, even just a fan of progression fantasy in general, this book
Ren CoryRoyal Road
★★★★★ 5.0
Children of the Cold Moon is a really fun spin on the isekai and LitRPG genre. It immediately jumps out for its Celtic/English Isles mythos flavor, which is super cool to see. It grabbed my attention, and as a long time fan of those myths, I was happy to see this populated with such a range of the classical names of the creatures and entities.
The style is fun, lighthearted, and a comfortable read for anyone who enjoys tales of heroics with a healthy amount of quips. The pacing is quick, shifting seamlessly into battles, quiet moments, and bits of exposition. None of them ever really feel to drag even with the obligatory exposition chapter that is efficiently conveyed.
The story follows Bren, a young man with a new and unusual destiny opening up in front of him. The introduction of the other world through the druid stone is a great departure from the usual one-way traversals that isekai often brings.
The grammar is solid and exactly what it needs to be, changing from quick paced action to more detailed moments of worldbuilding with great expertise. The author is very on top of ammending errors that readers point out, which is a commendable. I noticed nothing that inhibited my immersion.
The characters are so much fun, with a great dynamic between them and teases for development that can build with the plot. Bits of intrigue and mystique are present, with so many questions answered, but also left unanswered that the characters have distinct motives.
I recommend this to anyone who enjoys anything I've talked about, especially to isekai, litrpg, or fantasy fans. It has been an absolute delight to read thus far!