Golden Sun Strategy Guide

From the Official Nintendo Page:

Evil is slowly covering the world. Forces of darkness are pursuing the lost art  of Alchemy, and the fate of mankind hangs in the balance. You and your  companions, armed with weapons, Psynergy magic, and a host of elemental  creatures, must return peace to the world.

Golden Sun is an epic  role-playing game with an engrossing story, set in a massive world.  Gather the elemental Djinn – fire, water, wind and earth – and combine  them in unique ways to produce awesome magical effects. - Nintendo.com