Good guide overall, but as said above there, zekes isn't that necessary :P
Merc treads are way better to help Darius against CC.
Also last item hextech gunblade ?
You don't need the 70 ability power and active isn't that cool, to pay that much ^^
But as said, good guide and keep on working on it ^^

Thank you ^.^ and I pick zekes because it helps Darius land more hits on his target. Noxian Guillotine's damage is increased dramatically by how many stacks of hemorrhage are on it

K looks interesting but why zekes instead of mercs treads? Darius dmg mainly comes from being able to land his spells. + 1 btw