I mainly ask this cause because my friend showed me a game, and he faced the end boss, defeated it, faced it again, defeated it, and faced it again for a third time before the boss finally died. Personally, I don't mind if the boss revives, with subsequent cinematics or actions inbetween, though it does seem to be a tad much when he/she/it just "revives" three times in a row and you have to repeatedly kill them. That "I WILL NEVER DIE!!!" scenario does seem to be a bit annoying at times.