Colon is a one‑eyed stall owner in the Laca Market of Black City. He wears an eye patch, has rotten teeth, and a disgusting breath. He trades in various goods and information. He helps Karl acquire a breathing technique and a hidden arrow crossbow. He is opportunistic but values his relationship with Karl. He also mentions a secret route out of Black City for three hundred blackstones, though he is unable to leave himself.