Chaos Servant

Chaos Servant is a covenant in Dark Souls.

Requirements
There are no requirements to join this covenant.

Location
After defeating Chaos Witch Quelaag, reach the room with the circular floor and cobwebs lining eggs on the sides. The wall to the right is illusory. Inside, there will be an egg-infected man. Answer yes to his question to talk to Quelaag's Sister. Then go up and talk to her, she will respond with "...?", and after that you have the option to choose to join the covenant.

Benefits
Attain the Chaos Great Fireball pyromancy upon joining. After leveling up to +2, players also attain the Chaos Storm (an upgraded version of Firestorm) as well as access to the shortcut at Lost Izalith (The shortcut can be found to the right before the Demon Firesage boss in the Demon Ruins). Leveling up requires humanity.

Required offered humanity to level up: