The topic is the Chaos Servant covenant in Dark Souls. It is led by the Fair Lady, a blind Fire Keeper who poisoned herself to cure the denizens of Blighttown. Players can farm Humanity, often from rats in the Depths, to offer her and ease her suffering. Offering 30 Humanity unlocks a shortcut to Lost Izalith. This shortcut is critical because it allows players to kill a red-eyed Chaos Bug and save the knight Solaire of Astora from madness.