Shiverchill Mountains is one of the 9 accessible places via the map. In Shiverchill Mountains, you're assigned quests by Bok, who is the mountain's King. Bok will assign you quests in order to reclaim his throne back in which you must use the variety of mine tunnels to lead to different areas as well as fighting the mountain's snow creatures in your way. After completing the quests you will obtain 1 of the warden keystones, which is the Shiverchill Gem.
"Bok needs your help! His mountain is frozen over, and only a wizard can help reclaim his throne! Learn ice spells and earn the Shiverchill Gem!"