Suffocation, Mass

Necromancy
Level: Sorcerer */Wizard * 9, Warlock * 9
Components: V, S, M (a vial containing a bit of the caster's breath)
Casting Time: 1 Standard Action
Range: close (25 ft. + 5 ft./2 levels)
Target: one living creature/2 levels (no two of which may be more than 30 feet apart)
Duration: 1 round/level
Saving Throw: Fortitude partial
Spell Resistance: yes
  This spell functions as suffocation except as noted above. Note that the duration of this spell is much longer, forcing those suffering from the effect to make far more Fortitude saves to stave off eventual Suffocation.