The Ancient Spirits of Evil are evil spirits that Mumm-Ra summons in order to transform himself into Mumm-Ra, the Ever-Living. In addition, he sometimes invokes the Ancient Spirits of Evil to transform himself from Mumm-Ra, the Ever-Living to other forms to suit his purposes, such as the Netherwitch (The Astral Prison) or Diamondfly. The spirits are represented by four large statues surrounding the cauldron. Mumm-Ra uses the following invocation to summon the spirits to perform his transformation: "Ancient Spirits of Evil, Transform this decayed form, to Mumm-Ra, the Ever-Living!"