|Level||Med 4, Sum 4, Occ 5, Psy 5, Sor/Wiz 5 (lesser);|
Sum 5, Occ 6, Psy 6, Sor/Wiz 6;
or Sum 6, Psy 8, Sor/Wiz 8 (greater)
Source: Core Rulebook, pg(s). 321–322
The planar binding family of spells calls an unwilling outsider from its planar home in the Great Beyond to the Material Plane via conjuration magic. The spellcaster can then attempt to trap it in a previously prepared magic circle and convince or force it to perform a task for her in return for its freedom.