I like some aspects of this but I think the implementation of living shadow and surging dark side would be considered too complicated based on the level of difficulty of the other tanks.

I think DRK just needs Delirium and Abyssal drain changed at minimum and living shadow needs another mechanic to make it more interactive if they really want to blow me away.

I'm particularly salty about Delirium as using abilities without cost is antithetical to the resource management tank.