In Lufia 2, a SNES JRPG, there is a boss called the Giant Jelly, which disappears after three rounds. If you don't kill it in this time, you don't get the rewar

In Lufia 2, a SNES JRPG, there is a boss called the Giant Jelly, which disappears after three rounds. If you don't kill it in this time, you don't get the reward. However the ending condition isn't defeating the jelly, it's just the battle ending. So if you kill all your characters, the battle will end and you'll get the reward. One of the unique things about this is it's in a special 'battle tower' called the ancient cave, so dying after the final battle doesn't trigger the normal "game over" state.