Reaving Aura

Necromancy [Evil]
Level: Assassin 1, cleric 1, hexblade 1, sorcerer/wizard 1
Components: V
Casting Time: 1 swift action
Range: 10 ft.
Area: 10-ft.-radius emanation, centered on you
Duration: Instantaneous
Saving Throw: None
Spell Resistance: Yes
The air around you turns black as it floods with negative energy.

This spell deals 1 point of damage to every creature in the area that has 0 or fewer hit points. Stable creatures that were at –1 to –8 hit points become dying, while creatures at –9 hit points die immediately.
This spell has no effect on creatures that have 0 or more hit points.

Source: Complete Mage