Enlarged Form [MAJOR]
You grow, becoming an freakishly large specimen of your kind.
MP Cost: 6.
Benefits: You become as large as your size category allows (8 feet tall for Medium-size characters, 4 feet tall for Small characters). However, you function in many ways as if you were one size category larger. Whenever you are subject to a size modifier or special size modifier for an opposed check (such as during grapple checks, bull rush attempts, and trip attempts), you are treated as one size larger when it is advantageous to you. You are also considered to be one size larger when determining whether special attacks based on size (such as improved grab or swallow whole) can affect you. You can use weapons designed for a creature one size larger without penalty (for example, a Medium-size character with this mutation can wield a Large weapon one-handed).
This mutation does not change your face or reach.