The caster creates a small, magical zone that can detect the passage of enemy creatures. When the field is activated, it explodes, doing 1d6 points of sonic damage per two caster levels to all creatures within the area of effect, boosted by Lore, with no cap. After being triggered, the glyph dissipates. If the glyph remains set for at least one round, it receives +3 Spell Penetration per focus feat in Abjuration.
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