I don't want to over indulge this build with info, so I'll keep it short.

Okay, so buy the items above ^^^ - [When you get, or if you get to the blood thirster, sell your Wriggles Lantern to make room for it] - [So far I have found one alternative to buy - either the Warmogs OR Frozen Mallet, your choice] - [Also, if you chose Frozen Mallet, I'd recommend taking Randuins Omen instead of Frozen Heart]

Only last hit, you really don't want to push your lane as Darius, he's great for helping junglers so keep the lane even to help your jungler out. When the enemy hero gets close, harass with your Q (try to hit with the outer ring, you'll do TONNES of damage)

When attack, remember this Q>W>E> - Only use your R when they have 5 stacks of your Passive so it will do max damage, or if they are on really low HP, try to finish people so there is no cooldown. Use Q whenever you can, same goes for W, only use your E on fleeing enemies, or if you are trying to lure an enemy to you to save a team mate/initiate.