In Dungeons ... part of a Lich’s soul, tethering the creature to the material plane (or whatever plane the phylactery might be on). In older editions, it had to be a jar or a metal container ...

Become a warrior who has fallen into the past and embark on a journey to save the future with the Soul Jar. Cleanse dungeons of enemies and bosses, and set out to break the cycle of RIM.