Wireworm

Wireworms are parasitic monsters that can take over the likes of Goblins and humans.

Manga
Two infected one goblin and a man that the Heroes needed to kill as per the man's daughters' request.

Anime
Two infected a goblin and the man Jezby claimed was her father, another took over Iris's head. It turned out Jezby had infected both as part of her Blood Ritual.

Abilities
Danger Level: E