Instead of nerfing darius
all he needed was to push some power from his early game to his lategame. his overall power was fine. he was just a bit too weak in teamfights and mostly still bullying a lot in lane.
a) hemmorrhage damage changed to 2*darius level (+.3 bonus ad) from 9 + darius level (+.3 bonus ad)
breaking even at lvl 9. lvl 18 base damage up to 36 from 27 per stack.
b) apprehend deals 1 token damage and applies a stack of hemmorrhage
less bullying with the bleed early on as it deals less damage in lane (still good enough to apply cleaver stacks). faster stacking in teamfights.
a powershift would have been enough instead of an overall nerf.