I've already read one thread where psychic warrior build gets insane damage via manifestation of claws and the rapidstrike feat chain from the draconomicon book. you have to be of the elan race though - making you a +0 ECL aberration. all your equipment and manifested powers then revolve around increasing the size of your claws to rediculous levels, and thereby, damage multiples.
although I cannot picture colossal size claws on a medium-sized chassis. just seems crazy... but legal by the RAW.
3.5 = Fighter vs. Psychic Warrior
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