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
One infected 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