The stern look combined with his awesome voice resonating with power, forced the other wizards to rename Grimbol the Great to "Grimbol Grumble." He was at one time one of the masters of the Thriff Guild of Enchanters.

In response to the encroaching evil caused by the Great Terror, he set out by boat with the Great Shuboz Shuboz, Khare the Watcher, Shad Treeskimmer, Isthur Glee, Raskil Worrysnot, and Finister to find Anesi who was living near Caper's Hill. These wizards believed that his youth would be the greatest advantage against the Great Terror, for he still had his innocence and would not be tempted to evil like most others. When they first arrived at the home of Anesi, his family boarded themselves up in the smoke hole behind their house. It was the VAXUM of Grimbol that prevented Choboz was besetting the group of wizards with his axe. Grimbol the Great took care of Mildi and Choboz while their son was gone on the quest, and after Anesi returned, was willing to stay around for as long as was needed.