Artificer Attack 23Armor of Acid

You cast a prepared liquid onto an ally’s armor, shrouding that comrade in a cloud of noxious fumes that harms foes.

Encounter        Acid, Arcane, Implement
Standard Action      Area burst 1 centered on you or one ally within 10 squares

Target: Each enemy in the burst

Attack: Intelligence vs. Reflex

Hit: 3d8 + Intelligence modifier acid damage

Effect: Until the end of your next turn, the ally in the attack’s origin square gains resist 15 acid, and any creature that makes a melee attack against that ally takes acid damage equal to 10 + your Wisdom modifier.

Published in Eberron Player's Guide, page(s) 55.