Glowworm

The Glowworm is the name given to the creature that lived inside Squire's mind. They are typically docile creatures that lived in the dimension between the mindscapes of all people. The fed off the residual energies given off by the memories of people. Acererak stole two or three of them and experimented on them, turning them hostile. Mingal and Dort happened upon them in the Tomb of Memories, where they entered the goblins' mindscapes. They needed to keep their hosts alive, so when the hosts died, they would consume a humanoid nearby and the related memories in the host's mindscape.