you will need a Ship.

Go to Icepeak Castle in the Northern lands. Take your Ship and move right util you find a small island with a crater. That crater is the entry for a construction full with alien, those are quite strong for lvl25, so you may want to skip most of random encounter, and fight only the one needed to unblock your road; at the end you will fight a cube alien, and then you will get into a reward room that will upgrade your blue ring so the weather will gain a small amount of MP every time someone cast a spell.

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