Alchemical Blood is a heroic tier feat. Prerequisite: Warforged Benefit: Choose a damage type—acid, cold, fire, lightning, necrotic, poison, or thunder. When you use an attack power or alchemical item attack power with that keyword, you gain a +1 feat bonus to the damage roll. The bonus increases to +2 at 11th level and to +3 at 21st level. While you have any temporary hit points, you gain an additional +1 bonus to your damage rolls with alchemical item attack powers.[Dr385:72]