Daesh

Daesh is the burning sword forged by Fulmar the Doomhammer to be the emblem of office for his sibling Archdevil, Maladrax the Bloodwing. It is a massive, crudely-shaped blade of black siderite, double-edged with a flared tip. It is huge and heavy, but surprisingly swift to the hand of its true master.
The metal of its blade is traced with cracks, through which a burning mix of hellfire and azoth flows, and etched deeply with glowing, infernal glyphs.