Phantasmal Asphyxiation

Illusion (Phantasm) [mind-affecting]
Level: Artificer * 4, Sorcerer */Wizard * 4, Warlock * 4
Components: V, S, M (an empty vial)
Casting Time: 1 Standard Action
Range: medium (100 ft. + 10 ft./level)
Target: one living creature
Duration: 1 round/level (D)
Saving Throw: Will disbelief, then Fortitude partial, see text
Spell Resistance: yes
  Your target must succeed at a Will Save or believe it can no longer breathe. An affected target must attempt a Fortitude Save each round at the beginning of its turn. The first time it fails the Fortitude Save, it is Staggered until the next time it attempts a save against the spell. If the target fails a second Fortitude Save in a row, it falls Unconscious for the spell's remaining duration. The target breathes normally while Unconscious, but is Shaken for 1 minute upon awakening. If the target succeeds at two Fortitude saves in a row, it shakes off the spell's effects entirely. Otherwise, the target continues to attempt a save each round until it falls Unconscious or the spell ends. This spell has no effect on creatures that don't need to breathe.