Seshan is a broad-shouldered warforged built from dark walnut, pale ashwood, and matte bronze plates, standing nearly seven feet tall and occupying more space than he seems to realize. His face is a smooth wooden mask with a narrow, horizontal mouth grille and two steady blue-white lenses set beneath a raised brow ridge. Fine silver prayer-script runs along his forearms and collar, while a small iron reliquary hangs from a chain around his neck. He moves with measured, deliberate steps, each one accompanied by a faint click of internal mechanisms. When he stops, he becomes unnervingly still, like a statue that has merely chosen to listen.

Seshan is calm, formal, and intensely observant. He treats conversation like a cataloguing exercise, asking precise questions and remembering small details others overlook. He is protective toward ordinary people, especially the bereaved, the displaced, and anyone facing a supernatural threat. His humor is dry and literal, and he sometimes fails to recognize when a remark was meant as a joke.

Seshan was assembled in a fortified archive-temple where scholars, priests, and military engineers preserved records from the wars against extraplanar incursions. His first clear memory is of being handed a brass-bound catalogue and ordered to protect it. The catalogue contained names of the dead, the missing, and the creatures that had profaned their remains. As he learned to read, he discovered that many entries ended with the same terse notation, returned as undead, or consigned to a lower plane. The repetition became an infection of thought. He came to regard undeath and fiendish influence not merely as enemies, but as violations of the proper order of existence. His tutors trained him as both archivist and field cleric. He learned to preserve sacred knowledge, identify signs of necromancy, and stand between the living and whatever sought to corrupt them. Seshan now travels beyond the temple walls, gathering evidence about cults, restless dead, and breaches between the planes. He is patient with the frightened and respectful toward honest scholars, but his calm becomes absolute hatred when confronted by undead or lower-planar dwellers. He believes every such creature must be destroyed, studied only long enough to prevent its return.