Dabus

Dabus are silent, floating beings who serve the Lady of Pain. Found only in Sigil, they communicate via illusory images resembling hieroglyphs that float above their heads, conveying their thoughts. 

The Dabus maintain the infrastructure of the city, repairing crumbling buildings, ensuring portals function properly, cutting back rampant razorvine, and patching city streets. Most of the citizens of Sigil ignore the Dabus, viewing them as nothing more than cryptic workers. However, the Dabus have the ability to punish those who disrupt city life. Anything that opposes the Lady's edicts or disrupts the smooth functioning of Sigil will be corrected by the Dabus, regardless of the source of the problem.