Their disruptive area attacks
Forsaken World Gold makes great solo avatars due to their variety of rebuffs and their pet. But their healing and power-replenishment skills are very weak, with slow timers and actually are transfers of power or morale from the Lore-master, leaving him dangerously weak. Moreover, their skill-set is focused towards slowly killing enemies one by one, so they clash a little with over-aggressive champions and their disruptive area attacks.