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Eingyi was once a pyromancer from the Great Swamp but his experiments with poison and toxic pyromancies caused him to be branded a heretic cast out. He traveled to Blighttown where he became infected with an unknown plague. Quelaan discovered him and took pity on him and against the wishes of her sister, Quelaag, sucked out the poison that was causing his suffering. This act left Quelaan in the sickly state the player finds her in and caused Eingyi to become forever loyal to her, despite his inability to understand her language or speak with her.
Eingyi can be found behind an illusory wall near the bonfire below the second Bell of Awakening. His body is still covered in the mass of parasitic eggs he was originally afflicted with.
Eingyi is initially distrustful of the player due to their lack of eggs. He will ask whether the player is a servant of his master. Answering yes is the only way to speak to Quelaan and join the Chaos Servant covenant.
After joining the Chaos Covenant covenant, Eingyi will still not fully trust the player. He will initially only sell the Servent Roster (a list of all the members of the Chaos Servant covenant) to the player. However, should the player become infected with eggs he will becoming more trusting and sell pyromancies and and egg vermifuges which can be used to remove the parasitic eggs. The player can also increase his trust in them by wearing the Old Witch's Ring and speaking to Quelaan.
Killing Quelaan will cause Eingyi to become hostile and attack the player in an attempt to avenge his mistress.