Soul of a Demon is a Boss Soul in Dark Souls 3.
Soul of a Demon
- Defeat the Fire Demon in the Catacombs of Carthus. It can be found by hitting the ropes on the wooden bridge in the room just before the High Lord Wolnir boss fight. After the animation ends, you can descend the bridge like a ladder to access a pathway to the demon's room.
- You can acquire this soul without fighting the demon. When you enter the room where the demon is located, aggro him and lead him up the stairs and onto the platform beside the chest. Strike the chest, and roll off the ledge. The mimic will defeat the demon(most likely). Alternatively, you can bait the demon to attack the sleketons, and the skeletons will crowd the demon.
- This is one of the few major enemies which can normally be attacked by other enemies. Both the mimic and the respawning skeletons can aggro onto the demon and deal significant damage to him. In terms of lore, this suggests one possible way the demon race has been almost destroyed. As the chaos flame weakened, the world the demons controlled turned against them.