Welcome to my third guide, in this one I'll tell you how to play the strongest solo top called Darius the noxian guillotine. I play epic ranked games with him as off-tank at solo top.

Runes is one of the most easy parts of darius pick Greater Mark of Attack Damage and Greater Quintessence of Attack Damage for damage and Greater Glyph of Scaling Magic Resist and Greater Seal of Armor for more tankyness. You can also pick more tanky runes but, then you'll miss the great damage output of Darius

I dont recommed tank masteries, with 21/9/0 you have lots more offensive power, and just that little more defensive. It's exactly what you need as off-tank

Because you have carry runes and masteries you can start with Doran's Shield, pick Boots and rush a Giant's Belt after it. Berserker's Greaves gives you some extra damage output. You can also choose to pick Mercury's Treads or Ninja Tabi if you want. I heard some people talking about Boots of Swiftness but if you want extra Movement Speed, just buy a Force of Nature after your Giant's Belt. Finaish you Giant's Belt into Frozen Mallet. Pick Wit's End for a nice attack speed and more magic damage. Go for Warmog's Armor to become more tanky. Now you have a nice health tank, go for Atma's Impaler to deal much more damage. Sell your doran's for Sunfire Aegis. If you still want movement speed, you build is finished here, but you can also sell your boots for a Force of Nature.
So are you off-tank now? I will show you
these items are fully tank

these are mixed

and your only carry item is this

so you can tank teamfights and still deal tons of damage.

other nice items
need more gold? pick philosopher's stone or Heart of Gold
are you against a fully Ad or Ap team? pick some more armor or magic resist.
you can also buy a sight ward, to push faster without being scared of getting ganked.

decimate is a nice skill, you can use it to farm or to do damage, open with it and max it first.

this ability can do some nice damage to turrets and champs, it also has nice CC, max it second.

its a great pull but you only need one point in it, the only reason for max it before your other abilities is that people buy armor.

WHAT A FANTASTIC ULTIMATE! just hit some low health champs with it and PENTAKILL especially use it on champs with much stacks of Hemorrhage on them.

your combo

Apprehend -> Crippling Strike -> basic attack -> Decimate
Keep doing this until you can kill your opponent with Noxian Guillotine and he's death.

Ignite, deals some nice bonus damage in combination with your passive, you can kill someone with 200 health with 5 stacks of Hemorrhage and ignite.
Flash, nice to escape ganks.

other nice ones
Heal, you can heal yourself nicely.
Teleport, dont lose your turret by leaving your lane, just tp back.
Clarity, claryity????, yes CLARITY darius is extreme mana hungry, clarity can greatly help him.