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The Proposal by Iapetus for Ryter21
Fandoms: Warhammer 40.000, Warhammer 40k (Novels) - Various Authors, Horus Heresy - Various Authors
25 Dec 2025
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Summary
Sanguinius is clearly the best choice for Emperor Regent of Imperium Secundus - this is something that both Guilliman and the Lion can agree on. Now? Well, they'll just have to convince him. Luckily for them, Guilliman has an excellent argument to fall back on, if they need it.
[Spoiler: They'll need it.]
Series
- Part 1 of Altar Diplomacy
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Unyielding by Iapetus for Lieara
Fandoms: Warhammer 40.000, Warhammer 40k (Novels) - Various Authors, Horus Heresy - Various Authors
27 Sep 2025
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Summary
When the Lion is discovered by the Imperium, Horus is sent to be his mentor. When that goes poorly, Sanguinius is assigned to take over the task.
They are not what the other expects.
(This story is a part of two different series - one as the first story in the series, and another where it is not. It can also be read as a stand-alone story.
Please see the Note at the beginning of Chapter 1 about pairings before reading.)
Series
- Part 3 of The Great Angel's Court
- Part 1 of A Courtship of Kings
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High Stakes by Iapetus for Lieara
Fandoms: Warhammer 40.000, Warhammer 40k (Novels) - Various Authors, Horus Heresy - Various Authors
25 Dec 2024
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Angels don't have fangs, right? Then again, is Sanguinius really an angel?
Torgaddon and Abaddon are determined to find out. (About the fangs, at least.)
(Takes place shortly after Sanguinius is discovered, when he's traveling with the Luna Wolves. And while this is part of a larger series, it can be read as a one-shot.)
Series
- Part 2 of The Great Angel's Court
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Macraggian Hospitality by Iapetus for Lieara
Fandoms: Warhammer 40.000, Warhammer 40k (Novels) - Various Authors, Horus Heresy - Various Authors
28 Nov 2024
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Summary
“You still don’t need to do this.”
Guilliman sat down on the couch next to Sanguinius. “I would debate that I do. Theoretical: The three of us have all been through grueling ordeals in the last several months, one right after another. We are exhausted. We are injured. We are grieving our sons lost, the relationships we thought we had with our brothers turned traitor, and the galaxy that we no longer have. But we are primarchs, and we need to be a symbol for our sons, and the common people. We do not have the same avenues available to use for stress relief. We cannot show weakness.
“Practical: Macraggian baths are legendary, and do much to ease the body and the spirit. You can be vulnerable around me, Sanguinius. You don’t have to be perfect. I know how to perform Macraggian hospitality. You can get some much-needed relaxation.”
(Takes place shortly after Unremembered Empire. Chapter 1 is Sanguinius/Guilliman, Chapter 2 is Sanguinius/Guilliman/Lion.)
Series
- Part 1 of Cultural Exchange
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Muddling The Sweetwater by Iapetus for Lieara
Fandoms: Warhammer 40.000, Warhammer 40k (Novels) - Various Authors, Horus Heresy - Various Authors
23 Nov 2024
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Summary
The rules of hospitality varies on Baal and it's moons. There is a thru line, of course, but Sanguinius understands the importance of nuance. So, when Sanguinius is assigned to be the Lion's mentor, he is determined to learn the rules of Aldurukhian hospitality out of respect for his brother.
In the strange world Luther now lives in - with Caliban welcomed back into the embrace of the Imperium - he wishes to aid his gain-brother wherever possible.
(This is a part of three different series. Prior knowledge to any of them is not needed to enjoy this story. Please see note at beginning for how these apply to the other series, if interested.)
Series
- Part 1 of Essence
- Part 4 of The Great Angel's Court
- Part 2 of A Courtship of Kings
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Efficiency by Iapetus
Fandoms: Warhammer 40.000, Warhammer 40k (Novels) - Various Authors, Horus Heresy - Various Authors
31 Oct 2024
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Summary
When assassins of a different Emperor's Children Warband make their attempt against Eidolon, Von Kalda is able to intervene first. Convenient, because he needs some test subjects that won't be missed.
(Please mind the tags)
(Extremely light spoilers for Eidolon: The Auric Hammer)
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Semper Imperatoris by Iapetus
Fandoms: Warhammer 40.000, Warhammer 40k (Novels) - Various Authors, Horus Heresy - Various Authors
22 Oct 2024
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Summary
Guilliman had made a fair argument - the three of them could only work off what was known. And in the moment, the Emperor was Sanguinius. If the ruinstorm cleared tomorrow, they would at least have tonight.
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The training felt like it would never end. Then, a stranger wandered into the training yard.
(No previous knowledge of Diablo - IV or in general - is needed to appreciate this story. Experience with MMORPG stories will help with the humor.)
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Seniority by Iapetus
Fandoms: Warhammer 40.000, Warhammer 40k (Novels) - Various Authors, Horus Heresy - Various Authors
05 Sep 2024
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Summary
"I'm telling you there is no route to Terra. There is only one light in the darkness. We have no choice but to fortify and consolidate here. Besides, I feel I have the authority to countermand your orders"
"How so?" asked Polux.
"Alexis," said Guilliman, "I have seniority. Until someone arrives who outranks me, I have command. I intend to use it. We must save the Imperium. Speculation and indecision are not useful traits at this time."
- From Unremembered Empire
Sanguinius finds out about this conversation, and he is not thrilled.
(Takes place shortly after Unremembered Empire.)
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Shared Compliance by Iapetus
Fandoms: Warhammer 40.000, Warhammer 40k (Novels) - Various Authors, Horus Heresy - Various Authors
02 Sep 2024
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Summary
Sanguinius knew he could order Azkaellon, Raldoron, and Amit into his bed, and they would do it, no questions asked. But he doesn’t want them in his bed because he’s ordered them - he wants them there because they want to be. What he doesn’t expect is when they start to catch feelings for each other. This is a delight or a headache for those aboard the Red Tear, depending on who one asks.
And, for some people, it’s both.
Now if this could only happen when they're not in the process of planning a rebellion, that would be ideal. (That's not gonna happen.)
Series
- Part 7 of The Great Angel's Court
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Improper Use of a Life Model by Iapetus for MossDweller
Fandoms: Warhammer 40.000, Warhammer 40k (Novels) - Various Authors, Horus Heresy - Various Authors
25 Aug 2024
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Summary
Nudity in life modeling is about artistic integrity, and learning to draw more than just the idealized body. When Sanguinius asks Azkaellon to model for him, of course he agrees.
There's nothing sexual at all about life modeling. At least, there isn't supposed to be.
Alternatively, Azkaellon is a little shit, and Sanguinius likes it.
(While this is set in a greater fic series that is Canon Divergent, this fic can be read on its own as if it was not.)
Series
- Part 5 of The Great Angel's Court
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A Balm (of Sorts) by Iapetus
Fandoms: Warhammer 40.000, Warhammer 40k (Novels) - Various Authors, Horus Heresy - Various Authors
18 Aug 2024
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Summary
In the wake of Brecht IX, Meros is ordered to bed-rest to recover. Kano is there to help.
(While this is set in a greater fic series that is Canon Divergent, this fic can be read on its own as if it was not.)
Series
- Part 6 of The Great Angel's Court
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Alar Aladi by Iapetus for Lieara
Fandoms: Warhammer 40.000, Warhammer 40k (Novels) - Various Authors, Horus Heresy - Various Authors
10 Aug 2024
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Summary
With war comes sacrifice, and often of small personal pleasures. When the Blood Angels wish to give Sanguinius back one of those pleasures as a surprise, the plan quickly becomes more complicated than they are able to handle. If they have any chance of success, Roboute Guilliman and Lion el'Jonson must be brought in on the idea.
How does one keep a secret from a primarch with precognition? Not very well.
(Takes place between Unremembered Empire and Pharos. Reading the previous fic in the Cultural Exchange series is not required, but does provide some additional context.)
Series
- Part 2 of Cultural Exchange
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Dualitas Hastarum by Iapetus
Fandoms: Warhammer 40.000, Warhammer 40k (Novels) - Various Authors, Horus Heresy - Various Authors
02 Aug 2024
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Summary
Sanguinius had cautioned Guilliman and the Lion that his change would be soon.
Shapeshifting was peculiar like that. He'd once described the sense of the change as if an old human could feel the drop of barometric pressure in their joints. “Its not painful,” he had clarified, “but there is the sense that it is time. I can feel it. The change is needed, and will happen.”
“Do you know what form you'll take?” the Lion had asked.
Sanguinius chuckled, and shook his head. “Not specifically. Sometimes I have no clue. Sometimes, I have an idea.”
When he had told them the change would happen soon, his smile was full of secrets. Sanguinius had an idea, and he kept it close to his chest.
Alternatively, Sanguinius can change his hair color and eye color. What if he could change more than that?
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Adjutant by Iapetus
Fandoms: Warhammer 40.000, Warhammer 40k (Novels) - Various Authors, Horus Heresy - Various Authors
30 Apr 2024
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Summary
When Mkani Kano is promoted and becomes Raldoron's Adjutant - his personal assistant - there is an unofficial tradition that happens after the ceremony and celebratory dinner. Something for just the two of them.
Series
- Part 1 of A Rose Distill'd
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At His Speed by Iapetus
Fandoms: Warhammer 40.000, Warhammer 40k (Novels) - Various Authors, Horus Heresy - Various Authors
10 Apr 2024
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Summary
Rationally, Raldoron knew that Sanguinius had other astartes lovers, and that they had been able to take him. And he could taste how much Sanguinius wanted to do the same with him, when his omophagea revealed the thoughts that Sanguinius would not give voice to.
...but he couldn't help those nerves, even if the idea also thrilled him.
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The Gift of the Rope by Iapetus
Fandoms: Warhammer 40.000, Warhammer 40k (Novels) - Various Authors, Horus Heresy - Various Authors
29 Jan 2024
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Summary
Mere rope cannot bind a primarch. But it's not for restraint that Raldoron binds Sanguinius with artful knots - it's for the freedom it represents.
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The Delay by Iapetus for Lieara, velocishadow
Fandoms: Warhammer 40.000, Warhammer 40k (Novels) - Various Authors, Horus Heresy - Various Authors
16 Jan 2024
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Summary
Due to an unexpected medical issue, the much-anticipated volume 69 of The Alabaster Feather - a volume heavily featuring Sanguinius - has been delayed.
Raldoron, Amit, and Azkaellon decide to try to use this time to find out more about the writers of these stories, by locating and reading the back issues. It's their duty as the inner circle of the Great Angel, after all. They are on special lookout for the writer with the pseudonym of Lcarus, who is rumored to be either an Astartes or a Documentarist.
Neither of those hypothesizes are true.
Series
- Part 3 of Unsanctioned Remembrancer Works
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Vibe Check by Iapetus for Sadistrix, velocishadow
Fandoms: Warhammer 40.000, Warhammer 40k (Novels) - Various Authors, Horus Heresy - Various Authors
13 Jan 2024
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Summary
Nassir Amit hadn't gone looking for The Alabaster Feather - the zyne of Astartes (and sometimes Primarch) Real Person Fiction - when he had discovered a copy of volume 68. He found it completely by chance, much to the previous owner's horror.
Series
- Part 2 of Unsanctioned Remembrancer Works
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A Clean Slate by Iapetus for mournivaldisco
Fandoms: Warhammer 40.000, Warhammer 40k (Novels) - Various Authors, Horus Heresy - Various Authors
31 Dec 2023
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Summary
There was a distant part of Sanguinius' mind that wondered how he got here: a room with two simple chairs sized for primarchs, and little else. He'd been on the Vengeful Spirit, fighting Horus, gone mad by Chaos. He'd been bleeding, battered, broken.
And he had been dead. He was sure of it.
(No spoilers for The End and the Death Part II)