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Source: Encyclopedia Arcane: Battle Magic

Description: You are able to reduce the area of effect of a spell in order to increase its damage

Prerequisites: Battle Magic

You are able to reduce the radius of a spell's area of effect by 5 feet to increase its damage by 2 dice. Spells affected by this feat require two additional spell slots to be cast. Only spells with a radius listed in the area of effect can benefit from this spell.