Rune of Vitriol

Rune of Vitriol
Type of Feat: Reserve Prerequisite: Ability to cast 3rd-level spells, Spellcraft 6 ranks. Use: Selected.

You can channel magical energy into runes of acid. As long as you have an acid spell of 3rd level or higher available to cast, you can throw an acid rune. The rune affects a 10-foot-radius burst and deals 2d4 points of damage per level of that acid spell. A successful Reflex save halves the damage. The rune lasts 30 seconds if no targets enter it's area of effect and this feat has a 30 second cooldown. Only one rune can be active (including runes from the other Rune of X feats).

Trigger Spells: Acid Fog, Greater Shadow Conjuration, Melfs Acid Arrow, Storm of Vengeance, Mestils Acid Breath, Vitriolic Sphere, Lesser Energized Shield, Energized Shield, Weapon of Energy, Orb of Acid