find small errors in a game and use them.
for example: most Bosses in RBO target the next possible player character, and heres the plan:
Have a thief with "Hide", an easy (D - D) move that makes the thief invisible, immobile and invulnerable.
however, he can still be the target of aimed attacks.
have the thief hide at one of the edges when the boss is nearby and stay hidden.
you regenerate more SP then you lose when activate "Hide"
the rest just bashes the bosses head in.