Wall of Ice (spell)

Wall of ice is a spell that creates a cold sheet of natural frozen water, as high, wide and thick as desired according to the area of effect given. The wall's use permits defense or the trapping of large creatures within its environs, though in comparison to stone or iron, the ice wall is comparatively less resilient against attack.

Wall of Ice

Range	10 ft. per level
Duration	10 rounds per level
Area of Effect	500 +100 cubic ft. per level
Casting Time	2 rounds
Saving Throw	none
Level	mage (4th)

The wall cannot be less than a foot thick and no part of it can be created beyond the range of the spell. Further, its height cannot be more than 50% of the structure's width. Thus, a wall that was 30 feet high would need to be 60 feet long, which would be 1800 cubic feet at the minimum, requiring a character of no less than 13th level. One hundred cubic feet of ice weighs nearly 3 tons, so it should not be presumed that a wall of ice could be pushed over by anything short of an earthquake.

Defense against Fire

Effects of fire damage against a wall of ice

Damage (hp)	Ambient joules caused	Result against 1 ft. thickness
6-8	6.1 million J	surface melting only
9-13	24.6 million J	heavy melting and scarring, no clean hole
14-21	98.3 million J	enough to burn through about 1 cub.ft.
22-34	393 million J	enough to burn through 5 cub.ft.
35-55	1.57 billion J	enough to burn through 20 cub.ft.
56-89	6.29 billion J	enough to burn through 80 cub.ft.

Depending on the attack form,