Otiluke's Polar Screen (Evocation)

Level: 5
Range: 5 yards/level
Duration:  5 rounds/level
Components: V, S, M
Casting Time: 5 segments
Saving Throw: Special
Area of Effect: 20' square/level

This spell creates a misty,
bluish-white screen of energy that can be shaped to form a
wall, hemisphere, or sphere dimension. Any creature passing
through the polar screen will be affected as if the creature
suddenly passed through a freezing blizzard. Any
creature who fails a saving throw versus spells will be coated
with ice crystals for 1d4 + 1 rounds until the crystals
melt away, during which time the creature suffers one
point of cold damage per level of the caster. The creature is
also severely chilled, suffering a -4 attack penalty until
the ice melts. A creature who makes the saving throw is
only affected by the ice crystals for one round, but is affected
in the same way as those who fail the save. A melt spell
will dispel the ice crystals from a creature’s body, while a
fireball, but no other flame, will destroy the polar screen.

MC: A thin sheet of fine lead crystal
and a few bluish-white quartz crystals, all of which vanish
after the spell is cast.