Mind Fog
From HGWiki
Caster Level: Bard 5; Herald of Storms 5; Sorcerer/Wizard 5
Innate Level: 5
School: Enchantment
Descriptor(s): Mind-affecting
Component(s): Verbal, Somatic
Range: Long (40 metres)
Save: Will negates
Spell Resistance: Yes
Area of Effect/Target: Colossal (10 metre radius)
Duration: 2 Rounds + 1 / 2 levels
Description: This spell creates a bank of blue fog that saps the will of all those who enter it. Victims take a -10 penalty on will saving throws against mind-affecting spells and effects. This penalty persists for as long as the creature remains in the fog and for an additional 2d6 rounds upon leaving. At CL41, ignores immunity to mind spells. Receives +1, +2, +3, or +4 DC for GSF/ESF/LSF/PSF Enchantment.
Notes
If cast by a Herald of Storms enemies must also make a Fort save or be Feebleminded, draining Int Wis and Cha by (CL/10)d4 and wiping 10% of their spells.
This spell is extremely helpful if you have a Turner Cleric or other character the uses the Turn Undead effect in your party.