Täkka Kettinen is a narrow-shouldered woman whose movements are economical until she believes someone is lying, when every gesture becomes sharp and birdlike. Her skin has the dry, pale texture of birch bark, crossed by faint gray veins that darken near the inherited mark on her wrist. She has a chipped front tooth, a crooked nose that was broken by a revenant child, and fingers stained permanently brown by lampblack and old blood. Her eyes are watchful and severe, yet her smile is unexpectedly warm and almost grandmotherly. She walks with a slight limp but can cross loose rubble without making a sound. The contradictory impression she leaves is of someone both fragile and impossible to corner.

Täkka is patient with ignorance but merciless toward deliberate dishonesty. With strangers she is dryly generous, sharing food and warnings without asking for payment. With family she is controlling and suspicious, because intimacy makes her expect betrayal. In a calm mood she is precise, almost tender, and fascinated by small living things. When angry she becomes theatrical, reciting old oaths as accusations. When grief-stricken she turns practical, cleaning weapons, sorting bones, and refusing to discuss feelings. She sincerely wants to save people, yet she is willing to endanger them if she believes their survival would preserve a greater lie.

Täkka was born in the hill village of Kaarikivi, where her family served as keepers of the Old Hills' boundary stones. The Kettinen wardens were not soldiers. They memorized names, repaired oath tablets, and carried bone lanterns into the underground halls whenever the dead began knocking from within the walls. When Täkka was nine, her mother took her below the hills during the Long Thaw. They found the dungeon's central bell split in two and an entire burial procession standing motionless around it. Täkka's mother recited the Oath of Seven Doors, but one clause had been scratched away. The dead turned toward them. Her mother pushed Täkka into a drainage shaft and stayed behind. Täkka survived three days underground, drinking meltwater from skulls and following the sound of a bell that no longer existed. That experience changed her from a dutiful child into an obsessive interpreter of broken promises. Years later, she became an itinerant occult scholar, copying grave inscriptions and trading prophecies for food. She discovered that the undead beneath the Old Hills are not raised by a necromancer. They are enforcing an ancient pact whose final witness was deliberately erased. Täkka now carries a forbidden map drawn on stitched funeral shrouds. The map changes whenever the coming darkness draws nearer. She distrusts Hadrik Voss, the local quest-giver, because his grandfather was one of the men who removed the missing clause from the oath. Täkka's current problem is that she has begun sharing dreams with the dungeon's principal monster, an oath-bound dead guardian who calls her 'last witness.'