IF YOU LIKE PLEASE VOTE UP :)

So here is the finalized build after many test runs. I find this is the funnest and most effective at killing carries.

FAQ's: I dont get FROZEN MALLET because Darius naturally has a slow and the money is better spent on defensive items or damage items. I dont get BLOODTHIRSTER because Darius is NOT an auto attacker and his abilities dont proc the lifesteal ability. That is why TRINITY FORCE is so good because it makes sure that when he does auto attack in between abilities, it hits them hard.

COOL DOWN REDUCTION: I have found the CDR is amazing on Darius. With the masteries, glyphs and lucidity boots he will get his slow every 2.53 seconds. Plus the added slowing of trinity force to make sure they NEVER get away. With sheen you can kill there carries in about 4 seconds. Just run in with your speed, apprehend, auto attack, W, auto attack, Q, auto attack and ulti. They will be dead.

MERCURY TREADS VS IONION BOOTS OF LUCIDITY: Dying is not the end of the world and a lot of professionals know the strategically killing urself can give you an advantage.
examples: losing a life to tank an enemy tower to kill it is worth it. If you kill two carries and then die it is worth it. SO being able to get away safely with tenacity is ok i guess, bu i play to win. AND most of the time when i get them they still end up catching me. But with zeal and boots you can get away most of the time if your good with your attack timing and juking.

This build is about fun and OWNING!! and you will, so forgo tenacity and try CDR instead and you will see what i mean.

RUNES AND MASTERIES: Darius gets enough armor pen from his ulti, and i have had better results taking the mana utilities and attack damage marks then any other set up on mobafire. Darius' strength is in his abilities and being able to spam them more often will get you the kills, an extra bit of armor pen wont.

PLEASE TRY MY BUILD BEFORE COMMENTING - it is a lot of fun and is crazy effective. maybe not the best build but i play for enjoyment and ****ing **** up for the other team...trinity force and sheen work on towers with your W so spam that **** and watch the towers fall.