*Hemmorhage:
Darius' basic attacks and damaging abilities cause enemies to bleed for 9 / 11 / 13 / 15 / 17 / 19 / 21 / 23 / 25 (+ 43% bonus AD) magic damage over 5 seconds. This stacks up to 7 times for a maximum of 175 (+ 300% bonus AD) magic damage over the duration.
Darius gains 1% Lifesteal per stack for Hemmorhage ticking from bleeding enemy champion. (max 7%)
Decimate: Range: 425 Cooldown: 9 / 8 / 7 / 6 / 5 Cost: 30 mana
Active: Darius swings his axe, dealing physical damage to all enemies within a 425-radius area around him.
Shaft Physical Damage: 200 (+ 75% bonus AD)
Champions more than 270 units away from him are hit by his axe's blade, and will take 40% additional damage.
Blade Physical Damage: 280 (+ 105% bonus AD)
Unclogged Wounds: Range: 400 Cooldown: 20 / 18 / 16 / 14 / 12 Cost: 50 mana
Passive: Every Darius basic attacks reduce the movement speed and attack speed of and enemy champion by 3/4/5/6/7 times its Hemmorhage stacks for 2s. (49%max)
Active: Darius leaps forward, his next basic attack open deeper wounds on the target and adds a second stacks of Hemmorhage.
Apprehend: Range: 595 Cooldown: 24 / 21 / 18 / 15 / 12 Cost: 50 mana
Passive: Darius basic attacks deals true damage equal to 2/4/6/8/10 times the number of Hemmorhage stacks on his targets.
Active: After a brief delay, Darius pulls in all enemies in front of him.
Noxian Guillotine: Range: 460 Cooldown: 120 / 100 / 80 Cost: 80 mana
Active: Darius leaps to an enemy champion and strikes a devastating blow, dealing true damage.
For each stack of Hemorrhage on the target, Noxian Guillotine deals an additional 25% damage.
When Noxian Guillotine kills the target, it can be recast within the next 20 seconds. This can occur multiple times in succession.
True Damage: 80 / 160 / 250 (+ 75% bonus AD)
Max True Damage: 220 / 440 / 687 (+ 206% bonus AD)
lvl 06 +100AD = 80+75 = 155 No stacks (235 OLD) = 426.25 Fully stacked (470 OLD)
lvl 11 +150AD = 160+112.5 = 272.5 (362.5 OLD) = 749.375 (725 OLD)
lvl 16 +200AD = 250+150 = 400 (490 OLD) = 1100 (980 OLD)
lvl 18 +300AD = 250+225 = 475 (565 OLD) = 1306.25 (1130 OLD)
*
The dot was increased and scaled for a more AD build and 7 stacks.
Decimate was slightly nerfed because you should be more glued to your target thanks to W passive.
the utility is the 7% life steal once fully stacked.
Crippling Strike changed to another ability (Unclogged Wounds here, name subject to change !) to gain a gap closer ability which does not deal any physical damage bonus just the standard autoattack reset and adds a second stack of Hemmorhage.
Apprehend was changed to have a more in line "Darius ability",passive now does true damage. range was increased as well.
Noxian Guillotine damage was reduced without any hemmorhage stacks, you will want your target to bleed before beheading !
Every numbers are subject to change.
All in all it's up to you to decide which way you want this champion to go. Moves can be done in any direction, it is not a matter of technical ability or implementation.
It is just a matter of will.