You have started a sacred quest. You must first take your green crystal, actually called by the ancients, a Tylacmos, and you must journey to the ancient mountains of the far East, the Colcolack Mountains. These are a hidden range, so you won’t find them on any map. Use your Tylacmos to guide you. Once you arrive at the stone of Olacque (don’t worry, you’ll know), you will want to talk to Oranoph (he’s a talking rabbit.) He will give you the rest of your instructions.