This is a very basic (set and skillwise) stamdk build.
Good tankiness with 3 heavy pieces and Nord, plus the champion points for single target and direct damage.
Good damage from both sets, with amazing burst CA in backbar.
The build is meant for you to rush the enemy, apply both dk dots (claw and breath) and smash their face with dizzing until you are in range of execute. Noxious breath gives major breach and the 2h sharpened mace with lover mundus lets you melt even the tankier builds.
If you're in a pinch go to backbar and vigor->frag. shield->front bar rally. That should leave you above 75% health. Also your ults gives you back a good amount of resources and health, and can turn the tables pretty drasticaly in a 1v1.
You should have up at all times both rally and volatile armor, while using cauterize before entering a fight.
Hope you like it!