Hieronymus Grubwiggler is a wizard in Greysky City. His assistant was Giro. He experimented with 'envivification' and created flesh golems. His castle was a target of Haley Starshine until he bought "protection" from the Thieves' Guild. Celia visited him so that she could resurrect Roy, however all that Grubwiggler did was envivificate his skeleton, giving her a remote so that she could control him. When Celia refused to pay him the GP, he attempted to seize her, but Haley showed up and hit him on the head, disabling him.