Quadrant B1, I know quadrant E1 looks like the last room of the dungeon, but it is actually this one, where you can either get a tunic that doubles your sword strength or your defense.
Perspective shot of the dungeon.
Top down view of the dungeon, I think its supposed to look like a tunic. Also, this is the only dungeon in the game that actually has "Dungeon" in its name.
Next up is the Ukuku Prairie, followed by the Key Cavern.