A series of challenging battles arranged in a 14-level pyramid structure. The entrance, on the top level, is "room" 1-1. From there, choose your path downward through adjacent rooms. Each floor contains more rooms than the floor above it, with the rightmost rooms being the hardest. Certain rooms contain new weapons for the characters in addition to XP rewards. Each run through the Yōma's Nest is a gauntlet. The goal is to clear as many consecutive rooms as possible, to maximize your XP, before leaving. (You can skip to lower rooms once you've cleared them.) But beware: Your health doesn't regenerate between rooms, and if you lose a fight in any room, you'll forfeit most of the XP you've gained on that run.