Tempest breath

Tempest breath, also known as Mestil's acid breath is spell of the conjuration school used by some sorcerers, particularly dragon sorcerers. When a sorcerer casts tempest breath he or she exhales a green mist of acidic vapors that burn and disorient any creatures within a nearby zone of fifteen feet in diameter. Creatures affected by tempest breath are prevented, for a moment, from taking advantage of their enemies' weaknesses, so disoriented are they by the spell. Dragon sorcerers who use tempest breath are able to, in addition, conceal themselves from sight for a moment through use of the remaining mist. The spell is not particularly easy to cast, but it requires only a rest of a few minutes to be recharged.

Before the Spellplague, tempest breath was more commonly known as Mestil's acid breath and was used by both sorcerers and wizards. Like many spells of its time, it grew in power as its caster did, and could only be cast as often as the sorcerer had energy left for spellcasting or a wizard had prepared for it. After the Spellplague, no such restrictions remained.