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Fireball RuneHazard 5

Evocation Fire Magical Trap 
Source Core Rulebook pg. 524 4.0
Complexity Simple
Stealth DC 24 (expert)
Description An invisible rune creates an invisible, spherical magical sensor with a 20-foot radius.
Disable Thievery DC 22 (expert) to erase the rune without triggering the sensor, or dispel magic (3rd level; counteract DC 20) to counteract the rune
Fireball [reaction] (arcane, evocation, fire); Trigger A living creature enters the sensor area. Effect The rune detonates a fireball centered on the triggering creature’s square. This is a 3rd-level fireball spell that deals 6d6 fire damage (DC 22 basic Reflex save).