I think it is withdrawl. I mean, it deals huge amounts of damage, it has the most healing in the game, and it costs no focus, it actually regenerates it. And if you are not a poison type, the single flaw of withdrawl is that its element is darkness. i actually did,with my level 30 bio that has all strength, speed and instinct the same, like 20000 damage, and then healed 400% of my health for 3 turns!
if you know any stronger ability (i doubt you know) post it here
