Hellmaster's Jar (Japanese: 冥王の壷 Romaji: meiō no tsubo; lit. "jar of the king of darkness") is a type of magical vase appearing in Slayers EVOLUTION-R. The vase's purpose was the manipulation of souls: a Hellmaster's Jar could be used to move a soul from one body to another, or to provide refuge from death for a disembodied soul. Another jar was used to bind Posel's soul into the form of a stuffed toy, and yet another vase was found in an unnamed ruin by Lina and the others which kept the soul of Naga the Serpent in a suit of armor.