Working out a new rote for a Sorceror character.

Was thinking of it being a Spirit Evoc spell, damage dealing, single target, but *only to a disembodied spirit/ghost, or to the spirit/ghost that is possessing/inhabiting a body*, not to the Host's body, or to any non-disembodied supernatural.

For example:

Sorc A uses this rote on a visible ghost. It deals damage.

Sorc A uses this rote on a person being possessed by a ghost. The spell deals damage to the possessing spirit, but NOT to the host body.

Sorc A uses this rote on a Sidhe warrior. It does nothing.