Swamp Cave is a dungeon which connects north and south eastern Alefgard. The dungeon has 1 entrance on each continent. It is one of only a few places which is accessible in the original Dragon Quest trilogy.
Dragon Quest II
The Swamp Cave serves no real purpose in the game due to the fact that by the time the hero's party can access it, they already have a ship which eliminates the need to enter the cave.
Additionally, the cave has been downsized to a simple straight corridor with no treasure inside.
Dragon Quest III
The Swamp Cave is not fully completed during the time period of the game. Inside the north entrance, the hero's party can visit several workers who are busy completing its excavation.
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5 Seals ( Star Moon Sun Water Life) • Cloak of Wind • Evil Statue • Golden Key • Jailers Key • Leaf of the World Tree • Lar Mirror • Moon Shard • Rubiss Charm • Ship • Silver Key • Teleportal • Watergate Key