Planar Binding, Greater
School conjuration (calling) [see text for lesser planar binding]; Level: sorcerer/wizard 8
Components: V, S
Targets up to three elementals or outsiders, totaling no more than 18 HD, no two of which can be more than 30 ft. apart when they appear.
This spell functions like lesser planar binding, except that you may call a single creature of 18 HD or less, or up to three creatures of the same kind whose Hit Dice total no more than 18. Each creature gets a saving throw, makes an independent attempt to escape, and must be individually persuaded to aid you.