I don't like it. How did this pass the PBE?
Neither is it smart gameplay design, neither is it interesting and skillful, and neither is it balanced.
At least the old version had some skill to it, you had to work and collect the souls either it was useless, this one you just need to get someone low enough and you basically get help with executing someone. Also it can be teamwide with like a Karthus ult.
And I dont think this would even be fixed with numbers tweaking, its not about that.