Vaporizing Rending Blade (4e Power)

Vaporizing Rending Blade	Elemental Swordsman Attack 29
The power of flame within, you slash and don't stop.
Daily Arcane, Martial, Weapon
Standard Action	Melee weapon
Requirement: You must be calling the spirit of fire.
Primary Target: One creature.
Attack: Strength Vs. AC, two attacks.
Hit: 1[W] + Strength modifier damage. Make a secondary attack.
Secondary Target: The same or a different target.
Secondary Attack: Strength Vs. AC.
Hit: 2[W] + Strength modifier damage
Special: A target hit once takes 5 ongoing fire damage (save ends). A target hit twice takes 10 ongoing fire damage (save ends). A target hit three times takes 15 ongoing fire damage (save ends). A target hit four times take 15 ongoing fire damage (save ends) and the saving throw is made at a -5 penalty.