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Too bright.

Caelith had sworn the Vow when relations between Umbralyn and humans first began, to stand between humanity and the Fracture, to contain what would unmake them, and to protect even those who did not understand the cost. The words had once meant something sacred.

After his brother died, the Vow tasted like ash.

He gathered Umbralyn in the dark, voices low, hands clenched. He spoke of justice, of balance, of ending the slow bleeding of the deep, but beneath it all, there was an untempered rage. Grief quickly sharpened into something reckless.

When they struck, they struck too hard.

Human installations fell in a single, furious night - control arrays shattered, siphons torn loose with no attempt at subtlety, iron and stone left glowing where the Fracture’s raw pressure had been allowed to surge unchecked through breached wards. Guards killed where disabling would have sufficed; overseers dragged from their posts and left where they fell. It was not war. It was not even justice, not by the time the night ended. It was simply violence, given somewhere to go.

For one breathless moment, the Fracture stirred freely. And in that moment, Caelith felt a sharp, intoxicating triumph.

But that was the mistake. Humans responded the way they always did when the Vow was broken.

Suppressive wards flooded the deep. Kill-zones collapsed tunnels without warning. Umbralyn were bound, dismantled, erased. They were rewritten until nothing remained but function.

Some of them passed in the corridors for centuries afterwards. None of them knew his name.

Each time, Caelith was dragged from the aftermath, alive but restrained, and forced to watch as those who had followed him were stripped of name and will.

He understood then what his anger had cost.

Rebellion had not freed the Fracture; it had justified tighter chains on them.

In the aftermath, he was watched, questioned and tested, but no proof of command surfaced. He had not left a signature, only bodies.

He was always returned to duty. Chastened and forced to be useful. Apparently obedient.

So, he became everything they wanted.

He followed the Vow precisely. Not in spirit, but in letter. He volunteered for the rotations no one else wanted: fracture-adjacent monitoring, long watches, record verification. He corrected others when they faltered. He spoke only when addressed, and when he did, his answers were exact and impossible to challenge. Just like the way he’d spoken to Maia in the first week that she’d known him. She had thought it was simply how he was. She’d never once imagined it was armour, worn so long he no longer remembered putting it on.

Humans noticed.

At first, he was assigned as a stabilising presence, an Umbralyn placed near delicate systems to prevent “misinterpretation.” Then as an assistant. Then as an observer, always under the guise of oversight.

What they did not realise was how much he could already see.

He could see wardlines that were only visible to Umbralyn eyes. They breathed, bent and fractured microscopically under pressure. Where human scholars read symbols, Caelith felt intention. He felt stress points, harmonics, and the places where the Fracture whispered back.

He learned quickly what humans struggled for decades to understand. And he never told them.

Instead, he let them believe progress was slow.

He asked the right questions at the wrong moments. Suggested recalibrations that delayed outcomes by months. Redirected research into safer, narrower interpretations. When fragments were translated, he confirmed only what was already obvious, but never the warnings layered beneath, never the trajectories that pointed toward catastrophe.

To the scribes, he was invaluable.

To the Elders, he was useful.

To the system, he was harmless.

His eventual presence in the Archive became sought after. It was there that he learned the deeper patterns. Not just of the Fracture, but of humanity itself. How authority shifted, how knowledge was hoarded. How fear was disguised as stewardship.

And as generations of humans aged and new Elders and masters entered human ranks, they grew to know him as loyal, dependable and harmless. And they were right about all of it except the last part.

The next memory came quickly. This one was colder, years later.