Planar Summons

Special 
Summons a creature, from this or another plane of existence. The GM determines the predisposition and abilities of this being. Each plane requires a different Planar Summons spell. Some exceptionally potent entities might require their own spells! If the version of Planar Summons used does not specify an individual entity, the caster has no control over whom the spell summons. Planar Summons cannot be used on the plane for which it is intended. When the creature appears, the caster must immediately try to control it. Treat this as a Quick Contest between the caster’s Planar Summons skill and the entity’s Will. The caster is at +4 if he knows the creature’s “true name.” 
If the caster wins, he can give the creature a single command, which it must carry out.On completing this task – or after one hour in any event – the entity usually vanishes. However, some powerful entities can stay for as long as they wish . . . 
If the caster ties or loses, the creature will react badly. An “evil” being commits violence or vandalism, while a “good” one is more likely to depart in a huff and put in a bad word with the caster’s gods. Wild or chaotic creatures are liable to engage in theft and mischief. Extremely alien entities might react in disturbing and unpredictable ways.

Duration: Until the task is done or one hour, whichever is less. Usually. 
Cost: 1 point per 10 character points used to build the summoned entity. Minimum energy cost is 20 (although this will not always summon a 200-point being). The GM secretly determines the capabilities of all summoned creatures. Cannot be maintained. 
Time to cast: 5 minutes. 
Prerequisites: Magery 1 and at least one spell from each of 10 different colleges.