How can i build a frost tower?

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How can i build a frost tower?

I'm on level 14th and I am supposed to build a frost tower but I just don't know how to build it. On the tower menu there is arrow tower, mud tower, thunder, fire and guard tower but there isn't such a frost tower. How can i do it? Can you help me? Thanks in advance


you need to get to Lonely Iceberg. The map to Lonely Iceberg is given to you when you get the fish onFrozen Vale and give it to the hermit for his penguins

after you get to Lonely Iceberg make the potion for wiseman's house and he'll give you the knowledge of ice towers.