Xaddus' Musical Mayhem

This spell generates sound of such destructive nature that it slays any creature with fewer than 4 hit dice, causes creates with 4+1 to 5 hit dice to make a saving throw vs poison with a -4 penalty or be slain, and creatures of 5+1 to 6 hit dice to roll save vs poison or be slain. Any creatures remaining within the area of effect take 1d10 points of damage each round. the area of effect (a 40' long x 20' wide x  20' tall tunnel) moves away from the caster, and can be reflected (echo) down a corrdior or against a wall. The spell lastas for 1 round per level of the caster. If cast in an area where sound cannot be bounced (such as an open field), the spell dissipates in half the time of its standard duration (rounded up).