is the ability to become corporeal, thus enabling the user to move objects or assume a (temporary) solid and visible form.
List of Users
Certain spirits, such as Penny Halliwell and Patty Halliwell, when summoned through the To Summon the Dead spell, can assume a solid form after stepping out of the circle in which they are summoned. Other spirits, such as Rick and Nathan Lang have displayed the ability to become corporeal on their own by channeling their anger. Jackson Ward and Charlene Hughes were able to pick up objects.
The Necromancer, the ghost of a demon, could corporealize by absorbing other spirits. However, this effect was only temporary, depending on how strong the absorbed spirit was.
Valkyries search battlefields for the spirits of warrior and absorb their souls. Once they return to Valhalla and release the souls, the warriors will corporealize.
Wyatt Halliwell was able to summon Penny's spirit from inside Piper's womb and make her completely corporeal.