Here’s an idea out of my kitten to address the Necro’s problems with dealing with focus fire:
Entering Death Shroud provides 1 second of Distortion and a 50% speed boost. After that, DS behaves the same.
The numbers will probably need some tweaking and LF pool/generation as well to keep it balanced in smaller fights. The idea was to provide some sort of defense that scales well with the number of enemies. The speed boost allows the necro to create some separation (or close a gap) without allowing it to fully disengage so it still adheres to the overall design.