The shaman must draw or form a circle on the ground, and so long as he or she does not move out of the circle, any mortals within the circle are immune to possession attempts by spirits, and receive a -2 Armor Class bonus against any spirit's attack. The circle has no adverse effects on the shaman's own spells or powers, but does affect the attacks made by owned or allied spirits. As soon as the caster leaves the circle it ceases to function.
The material component of the spell is dust from the bones of an animal or person killed by a spirit, which must be sprinkled over the area of the circle.
Notes: Restricted to shamans, uncommon.