Dark Harvest

Currently Dark Harvest keystone works much like Siphoning Strike (Q), with some exceptions like not needing to last hit, and allies dropping soul essence. I think DH should be slightly reworked to grant Soul Essence based on the amount of damage you deal to enemy champions (e.g. every 500 dmg grants X souls), in addition to normally gaining souls on champ, large minion/monster deaths. It would make it more accessible to laners and provide more incentive for PvP action, trading and being aggressive.

Also, instead of having a timed window of 20s when you can use your empowered attack, I propose making Soul Essence grant you bonus adaptive AD/AP (or maybe on-hit damage?) when you reach certain threshold/milestone of stacks, in the way meeps deal more damage for every 5 chimes... perhaps after every 25 Soul Essence. So instead of a window, it'll be a permanent bonus. Might sound like a glorified Eyeball Collection but I think it's better than having to wait for cannon wave or try to gank 20s after killing a monster. The other Domination keystones are much easier to proc or can be used on-demand, including the new Hail of Blades.

Another way to make DH feel better is to make enemy champion and large monsters worth more Souls than allied ones. This will reward counter jungling, ganks and all-in/bully lanes.