From a sudden rift into the Plane of Shadow, a cold wind begins to blow. Torrents of shadow arc out, draining the life from nearby creatures.

This mystery creates a blast of electricity and cold energy, much like some of the most fearsome weather found on the Plane of Shadow. The storm strikes one target initially, then arcs to other targets.

The storm deals 1d6 points of damage per caster level (maximum 20d6). Half of this damage is electricity damage, and the other half is cold damage. After it strikes, the storm arcs (like the spell chain lightning) to a number of secondary targets equal to your caster level (maximum twenty). The secondary arcs each strike one target and deal half as much damage as the primary one did (rounded down).