Urgot on-hits

Urgot's W causes on-hits to do 1/3 damage so that he can't build Botrk and Guinsoo or Bloodrazor and do crazy damage since his W has 3.0 attack speed. However, I think "one-use" on-hits should be changed to do full damage. By "one-use" i mean on-hits that don't apply on every attack, like the Spellblade proc from items, or Grasp of the Undying. I think Dark Harvest might also count as on-hit.

I think Grasp could be a viable keystone for if it could do full damage (2.4% of his max health, since he's ranged) during his W. He can proc it pretty easily in lane against melee bruisers, and the 3 health per proc scales better into lategame compared to Comet. Since his W is his main damage output (other than his passive) he procs Grasp pretty regularly in skirmishes too. Right now during his W it will only deal a pathetic .8% of his max health (although he'll still get the full 1.2% heal).

I've never seen Dark Harvest (or any domination runes) used on Urgot, but it would also be pretty shitty to only do 1/3 of its damage if procced by his W.