wazaa

You inscribe a rune of fire on a solid surface within range, which stays dormant until a creature moves within 5 feet of it. When triggered, the rune explodes in a burst of flames. The creature must make a Dexterity saving throw. On a failed save, the creature takes 5d8 fire damage, or half as much on a successful save. The rune lasts for up to 10 minutes or until triggered.