Fimbulvetr (3.5e Spell)

''All tribesmen of the North know the stories of the Frozen Army of Frostfell, said to once have been the mightiest force in the land before being decimated by the witches of the Inner Circle, who summoned the very snows themselves to engulf the men in ice. Most dismiss the legend as a tall tale meant to scare children into staying to the southern edge of the Tundra, but anyone who has seen this spell at work knows how very real the witches’ wrath was.''

With a blast of the coldest air imaginable, you force all within the area of effect to make a Fortitude save or die. Creatures killed in this way are encased in a block of solid ice covering the space that creature occupies. This block has 3 hit points per caster level, and an AC of 5 + the target's size modifier. Melee attacks against it automatically succeed, and fire deals full damage to it. Once the block has been reduced to 0 hit points, the target's body is freed from the ice, but must be returned to life through other methods.

On a successful save targets, instead take 5 points of cold damage per caster level and are slowed for 1 round per level of the caster.

Creatures with immunity to [Cold] effects do not take damage and are not slowed by this spell, but may still be trapped on a failed Fortitude save. Creatures trapped in such a way are helpless and do not have line of effect with the outside. If not freed, they may die of starvation.