Moldorm is often considered one of the most frustrating bosses to defeat in the game, not because it can easily defeat Link, but rather, because the arena it is fought in is surrounded by a pit - if Link falls into this pit, he will suffer no damage, but will fall down a floor and be forced to fight Moldorm with full health, regardless of how much damage was inflicted on Moldorm previously. For this reason, conserving the hearts found in the pots just before the boss room is recommended.