Frost Vortex

You create a tiny dustflake that either races towards a target creature or hangs motionless in a chosen spot, as you choose. In the former case, you must succeed at a ranged touch attack to hit your target, but if you fail, it hangs motionless near your target. This spell is triggered whenever any living creature passes within 5 feet of the dustflake.

When this occurs, the spell takes effect. The air in a 20-foot radius sphere around the dustflake whirls violently about with a harsh hissing noise, then grows very cold, coating all solid objects within it with thick frost. The frost inflicts 1d4 points of cold damage per caster level (maximum 10d4) to all creatures within the area.
Range: Medium (100 ft. + 10 ft/level)
Sor 5, Wiz 5

From: Web