Human: Write a character description for a fantasy rpg of a Will-o-wisp a type of undead Assistant: 
The will-o-wisp is a strange and mysterious creature, appearing as a ball of flickering light. It is said that the will-o-wisp is the restless spirit of a person who died before their time, and that it wanders the world in search of a way to escape the cycle of reincarnation. The will-o-wisp is attracted to living creatures, and will often follow them for days.