Two versions of the same spell. One Common Magic, the other Sorcery.
Possession
Duration Special, Magnitude 5, Ranged, Resist (Persistence)
Using this spell a caster can transfer his consciousness into another body.
The caster's consciousness is transferred out of his body, leaving it comatose, and enters the target's mind. The caster is unaware of what is happening to his body.
There are two forms of possession, Dominant and Covert.
Dominant Possession occurs when the possessing entity literally takes complete control of the possessed body. The victim is fully aware that its body has been taken over but is absolutely helpless, unable to take any action at all. The possessor does not have access to any of the memories, skills or magic of the possessed but substitutes its own INT, POW and CHA, memories, skills and magic instead.
To detect a dominant possession requires a successful, unopposed test of either Perception if viewed magically, or Spirit Walking.
Covert Possession is when the spirit hides in the body of the possessed, riding it like a hitchhiker. The victim retains complete control over his body and remains completely unaware of his possession, unless the spirit chooses to inform him of its presence. The possessor senses everything the victim senses, but cannot access the victim's memories, thoughts or feelings.
Some spirits take over the victim’s body at night when they are sleeping, thus keeping their existence secret – save for inevitable physical exhaustion and fleeting nightmares. Another example of covert possession is a curse or disease spirit which infects that creature with some form of debilitation. No manner of magic or healing will stop the effects until the spirit responsible is somehow cast out.
No creature can ever purge itself of a possessing entity. They may only be exorcised by a separate individual defeating the possessor in spirit combat, or by successfully casting a specific type of expulsion magic. If the original body of a mortal possessor has been killed in its absence, then its soul dies when it is exorcised. Spirits merely return to the spirit plane.
Needless to say, a possessing spirit or soul can willingly abandon a possession at any time – unless they have been maliciously bound to that particular body. This spell terminates anyway, at the very next sunrise or sunset.
The Sorcery version is similar, with the following traits, and almost the same wording:-
Possession
Autonomous, Resist(Persistence)
Using this spell a sorcerer can transfer his consciousness into another body. This spell affects a maximum of 3 POW per point of Intensity.
The caster's consciousness is transferred out of his body, leaving it comatose, and enters the target's mind. The caster is unaware of what is happening to his body.
There are two forms of possession, Dominant and Covert.
Dominant Possession occurs when the possessing entity literally takes complete control of the possessed body. The victim is fully aware that its body has been taken over but is absolutely helpless, unable to take any action at all. The possessor does not have access to any of the memories, skills or magic of the possessed but substitutes its own INT, POW and CHA, memories, skills and magic instead.
To detect a dominant possession requires a successful, unopposed test of either Perception if viewed magically, or Spirit Walking.
Covert Possession is when the spirit hides in the body of the possessed, riding it like a hitchhiker. The victim retains complete control over his body and remains completely unaware of his possession, unless the spirit chooses to inform him of its presence. The possessor senses everything the victim senses, but cannot access the victim's memories, thoughts or feelings.
Some spirits take over the victim’s body at night when they are sleeping, thus keeping their existence secret – save for inevitable physical exhaustion and fleeting nightmares. Another example of covert possession is a curse or disease spirit which infects that creature with some form of debilitation. No manner of magic or healing will stop the effects until the spirit responsible is somehow cast out.
No creature can ever purge itself of a possessing entity. They may only be exorcised by a separate individual defeating the possessor in spirit combat, or by successfully casting a specific type of expulsion magic. If the original body of a mortal possessor has been killed in its absence, then its soul dies when it is exorcised. Spirits merely return to the spirit plane.
Needless to say, a possessing spirit or soul can willingly abandon a possession at any time – unless they have been maliciously bound to that particular body.
It's up to you to determine whether Possession should be a thing in your setting; and whether or not it should be Common Magic, Sorcery or both.