5.0 DRK has a Solid foundation, here's why.

[Reynhart]

I've asked this question elsewhere, but can anyone come up with a burst cooldown that is completely novel? I'm looking for something that you can't draw an analogy to any previously designed ability in the game.

That's the catch, it doesn't necessarily need to be a completely novel skill. It just needs to open something a little bit different.

I've suggested elsewhere that Blood skills should have a combo bonus, and that we had Scourge back as a Blood-dot.
For example :

• Quietus : Potency 200
• Bloodspiller : Potency 600, combo effect from quietus : potency 850
• Scourge ; Potency 900 over 60s, combo effect from bloodspiller : apply its full damage instantly

At normal times, you'd use those skills on their own since there's no way to gain 150 Blood. But during Delirium, you would do this massive three step combo that would be otherwise impossible. And with 100 Blood prior, you would even be able to do the full combo twice.