It depends. Against weaker fiends it's kinda pointless, because they don't do much damage anyway, but if you're against a boss and are in a bit of trouble, then it's worth it. Your character has pretty high defense as it is, so defending could drop damage down to almost nothing. But it all depends on what you're fighting.
wel it is up to trinity to say what it possible, I don't know if black mage and summoner may got together, I hope it for you
Can I still play somebody evil to the first group if the second group start or do I have to quite then? btw, last chance if you want to join me 'cause I don't mind going allone 😛