User blog comment:Patropolis/Dusk, the Shadowed Blade/@comment-27175337-20151129014032/@comment-7709681-20151129153431

I agree with the free crit. damage, but the bonus damage on-hit can be easily countered (And somehow should help him to detect Wards by not getting damage while in the Fog of War), and is not as overwhelming as Darius' and Mundo's 200 AD steroids, which are also more reliable and bring better bonuses along with the free stat.

What worries me is something you didn't point out with the E: At 40% CDR there's a minuscule time window of 0.6s to counter the ability, which sounds dumb, at 45% CDR is -0.2s, meaning that, if fast enough, can activate the ability again while already affected by it.