Flaming Longsword +2
You can will this weapon to burst into flame.
lvl 10 +2 5,000 gp
Enhancement: Attack rolls and damage rolls
Critical: +1d6 fire damage per point of enhancement bonus
Power (At-Will ♦ Fire): Free Action. All untyped damage dealt by this weapon changes to fire damage. Another free action returns the damage to normal.
Power (Daily ♦ Fire): Free Action.
Trigger: You hit with the weapon.
Effect: The attack deals 1d6 extra fire damage, and the target takes ongoing 5 fire damage (save ends).