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The Marsh Cave is the first true test in the game. It is a dungeon filled with nasty enemies and a difficult boss encounter. It is also the debut of the multi-chest system: some items can appear in multiple chests, but as soon as they are found in one of them, they disappear from the others.
The primary rule of the Marsh Cave is to conserve resources. You only have so many PURE Potions and FIR2 Spells, and you need to stretch them through a trip down three floors and back up with a boss fight in between.
The primary rule of the Marsh Cave is to conserve resources. You only have so many PURE Potions and FIR2 Spells, and you need to stretch them through a trip down three floors and back up with a boss fight in between.