Create a wall to block off enemies or to lock them inside. Draw a line where you want the wall to appear.
Deals X-Y water damage.
100% base chance to set Frozen-20% Water Resistance
+40% Fire Resistance
Cannot Move or Act
Merchants don't sell skill books for Ice Wall so it will have to be crafted (either by using a scroll found mid game or by crafting the scroll with CR 3).