This spell negates the effects of "Gas Form". If the spellcaster detects an enemy that has assumed this form, he can force it to revert to its original form. To resist, the target must succeed on a Wisdom saving throw equal to 10 + your proficiency bonus. If the roll succeeds the effect is negated otherwise the creature reverts to its original form and cannot transform back for one hour. N.B. This spell has no effect on other forms of polymorph or state change that do not have gas as the end result.