Yampi Desert Cave

Yampi Desert Cave is an optional dungeon-style location in Golden Sun: The Lost Age, hidden within the normal Yampi Desert. To arrive at this cave, which contains the boss Valukar and the summon tablet for Daedalus, you should enter Yampi Desert from the Alhafra end, and get to the upper left area of the first screen with help from the Sand Psynergy to get to the cave entrance. You will need the Teleport Psynergy to actually make it into the dungeon itself.

Notable about this cave are the facts it has the Venus Djinni Crystal and that every one of its normal monsters can drop a rare and desirable item.