This spell generates a billowing cloud of ghastly yellowish green vapors that is so toxic as to slay any creature with 4 or fewer Hit Dice and force creatures with 5 or 6 Hit Dice to roll Saving Throws vs. Poison with -4 penalties or be slain. Holding one's breath has no effect on the lethality of the spell. Those above 6th level (or 6 Hit Dice) must leave the cloud immediately or suffer 1d10 points of poison damage each round while in the area of effect.
