Minor Poltergeist
(Conjuration/Summoning)

Range:  0
Components:  V, S, M
Duration:  Permanent
Casting Time:  4 turns
Area of Effect:  Special
Saving Throw:  Negates

When cast, this spell causes a creature's spirit to be bound to a specific area. The wizard may elect to have the spirit enter a building or just to wander about a certain area. The type of spirit depends on the bone used, which is the material component. The spell's duration is one month per level of the wizard. After this period, the spirit is free to do as it pleases, leave or stay.
The saving throw is made at half the level or Hit Dice of the creature to which the used bone once belonged.

