- Caster Level(s): Wizard / Sorcerer 7
- Innate Level: 7
- School: Evocation
- Descriptor(s): Fire
- Component(s): Verbal, Somatic
- Range: Medium
- Area of Effect / Target: Huge
- Duration: 1 Round / 3 Levels
- Additional Counter Spells:
- Save: Reflex 1/2
- Spell Resistance: Yes
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 fire damage per caster level to all within the area of effect up to level 20, plus an additional 1d6 points per 2 caster levels thereafter.