Frostbite

(Frostburn, DnD 3.5)

Conjuration (Creation) [Cold]

Level: ; Cleric 5; Disciple of Thrym 5
Components: V, S
Casting Time: 1 standard action
Range: Close (25 ft. + 5 ft./2 levels)
Target: One creature/2 levels, no two of which can be more than 30 ft. apart
Duration: Instantaneous
Saving Throw: Fortitude half
Spell Resistance: Yes

You chill the air and create a layer of frost on the skin of target creatures.
The targets are entitled to a Fortitude save; those who fail take 6d6 points of cold damage and 2d6 points of Dexterity damage.
Creatures dropping to 0 Dexterity are frozen in a layer of ice, shivering and unable to attack, move, or defend.