Illustion (Phantasm) [Fear, Mind-affecting]
Level: Bard 2, beguiler 2, sorcerer/wizard 2
Components: V, S
Casting time: 1 standard action
Range: Close (25' + 5'/lv)
Target: One living creature
Duration: 1 rd/lv (D)
Saving throw: Will disbelief
Spell resistance: No
The target is dizzied by the sensation of falling. It must succeed on a DC 10 balance check each round to make a move action. If the target fails, it cannot move, if it fails by more than 5, it falls prone. While affected the target also takes a -2 penalty on all attack rolls and saving throws. Airborne creatures receive a +4 bonus to resist and do not have to make a balance check.
Players Handbook II, p. 127