Possession is the power to inhabit another being's body usually without consent.
When possessing another being, the possessor gains completely control of the victim's body. This ability is what allows demons and ghosts without a physical form to manifest on Earth, by forcefully taking control of the body of a living person. Once taken over, the host loses consciousness and won't be aware of what transpired during the possession.
They can also utilize their host's powers through possession.
- Original Power