There is no key for the chest in Keara's fortress near the one incased in ice, and no way clear the ice.

Treasure Hunter Chronicles: Ultimate locked chests


In the dragon cliff castle, the key for the chest at the top of one of the towers (that you have to jump to) is in a small chest on a platform near the top of the other tower.

Chest and book loc in tower next to Orobas hatch


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