I think Oblation should stay, it's the most interesting of the new additions. Saying TBN gets better over time is a weird thing to say when the only thing it gets better at is to lose you a mana spender. It needs to no longer be tied to your damage resource and it would be fixed. This ties into the sustain problem. Where Gunbreaker, Paladin and Warrior can just spam their equivalents on cooldown and get nice heals from it, DRK very often cant because it would just not break in time and eat up your damage resource. Dark Knight has to get full value from it or you're in for a bad time. I wish dark mind wasnt the way it is now because if SE happen to decide to make a boss that deals primarily physical damage DRK is just losing one mitigation due to boss design.

Using Living Dead may aswell be considered griefing.