Magic:Glyph of Warding

Abjuration [ Sonic ]
Level: Clr 3
Innate Level: 3
Component(s): V, S
Casting Time: 1 Action
Range: Short
Target: Large
Duration: 1 Minute/2 Levels
Counter(s): --
Saving Throw: Reflex 1/2
Spell Resistance: Yes
Metamagic: Empower, Extend, Maximize, Quicken, Silent, Still
Energy Substitution: Yes

The caster creates a small (2.5 M), magical zone that can detect the passage of creatures (any creature except party members can trigger the effect). When triggered, it explodes, doing 1d8 points of sonic damage per two caster levels to all hostile creatures within a large area of effect (to a maximum of 5d8). After being triggered, the glyph dissipates.