Otka Island

Otka Island is a location in Golden Sun: Dark Dawn

Otka Island has two things of interest and is a little difficult to get one of those two items.

To actually get to this item it is in the middle of the map a little blur close to where Izumo was the Lost Age but North.

It is here that you can acquire the Jupiter Djinn Lull for your party as well as the summon Catastrophe.

The Jupiter Djinni, Lull, is at the very beginning of this Dungeon and to get to it you need Himi as well otherwise you cannot get the Djinn nor Catastrophe because you need her Search Psynergy. Also of note you can not get Catastrophe without the Sol Blade due to it acting as a key in some parts of the game this being said you can still get the Djinn early.

The first 3 or 4 rooms is very easy after that it is quite difficult their is a few treasures here as well one Psy Crystal and more. The reason here is complicated is because their is no map whatsoever and Catastrophe is in the no map part of the dungeon. One solution is to always go up when possible along with Left. However if that is not possible go right and than down only if no other options available. So in importance Up, Left, Right, Down.

For Catastrophe you also need to defeat a boss called the Ancient Devil.