Dark Knight Simple yet effective buff idea

[Carighan]

they both fill a different role not gonna lie and if I can do it on a controller there isn't to much of a problem if I may be honest and I main darknight as a tank I just with that both would be separated or have 2 stack

They do? But they both do the exact same thing other than one being AoE and dealing less damage per target in turn.

As in, what different role do they fulfill? Why would I use Abyssal Drain on a boss if I can use C&S instead?