Glyph of Warding

Glyph of Warding
Spell level: Cleric 3, Druid 3, Paladin 2, Ranger 2
Innate level: 3
School: abjuration
Descriptor: sonic
Components: verbal, somatic
Range: short (8 meters)
Area of effect: large (5 meter radius)
Duration: 1 turn / level
Save: reflex 1/2
Spell resistance: yes
Description: The caster creates a small, magical zone that can detect the passage of enemy creatures. When the field is activated, it explodes, doing 1d8 points of sonic damage per two caster levels to all enemies within the area of effect, to a maximum of 10d8 at 20. An extra 1d8 / 3 epic caster levels of damage applies. Furthermore, once the glyph is triggered, the caster is alerted of all affected targets.