The Soul of a Demon is a boss soul in Dark Souls III.

In-Game Description

Soul of a demon.
One of the twisted souls, steeped in strength.
Use to acquire numerous souls, or transpose to extract its true strength.
Demons were born of the Chaos Flame, but the flame has not survived, and the demons are a dying race.


Obtained by defeating the Demon in the Catacombs of Carthus, just before the Abandoned Tomb bonfire.


Consume to acquire 20,000 souls or transpose with Ludleth to create either the Demon's Greataxe or the Demon's Fist.