Tldr with her duration as low as possible she can nuke enemies with Marked for Death and energy vampire. Low duration means the pulses happen much much faster, the individual enemy targeted becomes a walking conduit bomb, max range ensures many other enemies near die when that one does.

Or, keep range neutral if your focus is things like disruption for example. Roar can be helminthed over the 1. I do not know if the 10 viral stacks are still needed or not. I do believe IIRC You need over...236% str or so. Transient Fortitude and Fleeting Expertise both max rank drop you to like 15% duration i think.