Yes, Needs Tweaks
No, Needs Remake
Okay ultimate cooldown shortened, base armor and HP buffed and evasion added as part of the incorporeal ability. Seem better now?
Death nova is a great skill. The stun seems to long and the damage is negligible, though I do love the idea of a the sound effect. Tombstone should be modified so that it latches on to the closest corpse within a certain AOE (something like 400-500 seems fair). As for the ulti I can see it being a pain early game, especially with that swift. I question how the evasion it is given would play out and I think the speed boost it is given is to fast. Most heroes won't stand a chance of getting away from it and with the evasion it would be hard to stop.