Hi This is my first Darius Build witch i always build on my Darius and at the end i have like 20 kills and less than 10 deaths and it is fun to get this multykills and early game harasmet so you get fed and being so op in some cases but if you dont like the Black Cleaver you can build eather Tormnail OR Gardian's Angel.

For Marks I took armor pen. because with his bonus armor pen,from his "E" Apprehand you get lots of damage eary when you pull them and stard baisic attack with you cripling strike You will get more damage or when you max all the abilities you will deal increadble amount of damage and with "E" and "W" combined you might do more than 600 dmg and with armor pen. bonus and armor pen. from runes half of their health is down.I took for seals Armor because he has no escape abilities and is easy to catch and thats why if they dont have armor pen. you take less damage.For Glyph i took magic res.Because some people play fizz kennen or even fiddle top witch is not the best idea but for champs like Fizz you will need to watch your hp becase their mid can gank you and if they both are AP they wont deal as much dmg as they want its just like the armor he has ho escape abilities.Now Last but not least The Quints THE MOST OP RUNES EVER they give you the most for everithing so Armor Pen. With AD will deal the dmg you want and if you build just AD you runes are waisted when they have armor so i picked armor pen. with AD.When you have a champion like Darius,Draven Or Even Varus the best Quints are the AD Runes.

Pros
Easy to pick kills up
Fun to play with
Ulty resets un killing blow

Cons
No escape mechanism
Not the best Cc wit his "W"