What about creating an ACTUAL Dark Knight?

[Aluja89]

And that's where the high-risk/high-reward part comes into play. If you are good at the job and aware of the mechanics at play in the moment, you survive the AOE by getting out of the way. People are already making poor decisions and getting killed by AOE and needing healer to ress them, so...

Would this kind of DRK have a self sustain? If not then it's just going to bother the healer since the tank is always the primary focus, which is why it could potentially work.