The only way to heal in this dungeon is via heart panel. They are activated by the Zinge; the Bahamuts will summon a Zinge once they're killed. There are also two types of needle panels. The temporary ones appear and disappear regularly and are present on every stage except Battle 2 where they are permanent up. During the boss stages these panels will deal 4500 damage per pass; on every other stage they only deal 3000.