The small cave behind the Move-able statue at the top level of the town Altin is technically considered part of Altin Peak, having the same monster battles and music, and it contains a chest with a Psy Crystal. More importantly, climb down the ladder near the town inn to see a water-spouting Living Statue enemy run into another cave area, and when you follow it, you will see it get away from you by casting the Frost Psynergy on a puddle and using the subsequent ice pillar. Hop across this ice-pillar yourself, and continue chasing after it and slide down a cliff slide until you engage it in battle. Defeating it earns you the Frost Jewel, which grants any Adept the Frost Psynergy (merely a convenience, since Mia has always had access to the Frost Psynergy series in her default class series),