Vertigo Field

Vertigo field
Illustion (Pattern)
Level: beguiler 3, sorcerer/wizard 3
Components: V, S
Casting time: 1 standard action
Range: Medium (100' + 10'/lv)
Area: 20' radius spread
Duration: 1 rd/lv
Saving throw: Fortitude partial; see text
Spell resistance: Yes
The area within the field counts as difficult terrain, and attacks made into, through or from inside of the field have a 20% miss chance. A creature that begins its turn inside the field must make a fortitude save or become nauseated for 1 rd. Once a creature fails its save it does not have to make another save against it. You can chose a number of allies up to your caster level to protect from the nauseating effect only.
Players Handbook II, p. 128