These are really cool ideas, which close up some of his possible weaknesses. The ult damage element is really cool, it can also be upgraded through tier upgrades with a stun or a silence. Also, love the aoe idea, see it working with all abilities. 3rd ability - as you said or maybe having an aura that deals tick damage. 1st ability could do aoe on a burst? 2nd ability aoe - risking some of an ally hp and possibly jeopardize it with a next hp regain with aoe. Kind of have to decide which is better.
Abilities can be tweaked here and there, but the idea of a wraith like hero, with the ability to heal with dealing damage (possibly higher risk-reward), death protection ability which migh be helpful to take revenage, prolongue combo for someone whos being focused and might die. And burst delayed dmg abilitie, something like vendictas sniper shot in mind, but acting like a "curse" it might get bonuses from T1,2,3 for a greater result, possibly being useful to avoid dmg mitigation etc. Ult is just a fun (or not so for the enemy) semi cc maybe for escape/enagagement.
