Vale Cave

Vale Cave is an optional dungeon-style cave location accessible from within the town of Vale in Golden Sun. It is where you get the Halt Gem, whose Halt Psynergy can be first used in the cave itself to allow you to get a Jupiter Djinni named Kite.

Walkthrough
Inside the cave, walk north, and go left until you are standing on a platform in the water. Use Reveal to jump across a hidden platform to the other side. Go through the door on this side, and in this room go north along the platforms. Use Move on the box resting on the shore to pull it into the water, then walk across. Go south through the door. Grab the treasure chest, and note the Jupiter Djinni on the cliff below you. Go back into the previous room, push the box into the water once more and jump to the left shore, where another box is located. Slide this one into the water as well, then jump across the path it created until you are standing on one of the floating logs. Roll it to the right, then go through the door. Go down the left path, and follow it to a door on the south. Go through to find yourself in the room with logs. Push the one on this side into the water, and then jump across to the opposite side and push that log in. Walk south along where the log was and slide down the wall. Push the log on the floor, and it will roll across the other two to the far end of the water, creating a path. Take this to reach another area and go through the door. This will take you to the room with the Jupiter Djinni once more. Walk north, climb a ladder, and open the treasure chest to get the Halt Gem, which, when equipped, will enable the user to cast Halt. Then, walk towards the Jupiter Djinni. It will panic and jump down. Slide down after it, and it will run to the opposite side of the rocks. You can chase it for hours in a senseless game of tag, but instead stand on the side opposite it and cast Halt. Once you do, it will be temporarily disabled, enabling you to grab Kite. This Djinn is extremely useful, as it allows a member of the party to attack twice in the following turn. Go through the door and exit the cave. Halt can also be used on NPCs for a little entertainment.

Items
Nut - In a chest to the upper left of the room with both the Halt Gem and the Jupiter Djinn.

Halt Gem - In a chest at the end of the puzzle.

Djinn
Kite - It flees whenever you approach it, but you can stop it with the newly-acquired Halt Psynergy.