The Soul of Quelaag is a boss soul in Dark Souls.
- Soul of Quelaag, once daughter of the Witch of Izalith, but now a chaos demon.
- Special beings have special souls, and Quelaag's soul contains all aspects of Chaos.
- Use it to acquire a huge amount of souls, or to create a unique weapon.
Dropped by Chaos Witch Quelaag.
The Soul of Quelaag can be used to ascend a katana +10 into the Chaos Blade, or a curved sword +10 into Quelaag's Furysword.
It can also be consumed for 8,000 souls, or fed to Kingseeker Frampt for 10,000 souls.