Dark Souls Remastered | Killing friendly NPCs - Eingyi (servant by Daughter of Chaos)

Killing Eingyi doesn't yield any souls at first, but five worms spawn, each of which awards 18 souls, for a total of 90 (this is on NG). Eingyi does drop 2x Egg Vermifuge. He doesn't drop anything worthwhile and really isn't worth killing, but if you kill the Daughter of Chaos, he will become hostile and you'll have to kill him anyway.