The Bone Architect
The Bone Architect does not build the Ossuary in a yard. She builds it in combat. When she destroys a ship she takes the bones of it, the spars, the frames, the casings, and welds them on. The hull has grown by accretion. Parts of it are Combine gray. Parts are mottled chitin. Parts are Confederacy brass. It is a kill-count that still has to fly.
She sleeps in a stateroom made from the bridge of her first victim. She is said to speak to the ships in her hull at night. She claims they answer. The Dominion has not required her to prove it.
Source: codex:captain_bone_architect