New item to help make the Pony more desirable again?

[NEW ITEM] Duskblade of Draktharr Total Cost: 3250 G Recipe: Serrated Dirk + BF Sword + 850g +75 Attack Damage +5% Movement Speed UNIQUE Passive: +10 Armor Penetration UNIQUE Passive: Basic Attacks on an enemy champion apply Nightfall (120 second cooldown). Nightfall: After 2 seconds, deal physical damage equal to 90 plus 25% of the target's missing health. If you get a kill or assist on the target before Nightfall ends, the cooldown is refunded."

Looks like a good item for Hec if he's building for damage!