Explosive Enthusiasm

Weapon · 15000 gp · Weight 8

Whenever the wielder of this +1 flaming greatsword confirms a critical hit with it against an enemy, it triggers an explosion of flame similar to a fireball spell centered on the enemy. All creatures within 20 feet, including the wielder and their allies, take 6d6 fire damage. A successful DC 21 Reflex save halves this damage.