With 5 points invested in Dark Binding (which increase up to +200 % the damages), the damages are around 300.
The scope of the explosion is too very limited (compared to Sacrifice for exemple).
We are far from the damages a Sacrifice can do, and it can’t be used as a main source of damages.
I am aware or I guess that Doom Brand, is more a way to kill your omn minions, for specifics reason a Necromancer can have, but the damages are so low that any strategy around Doom Brad to damage the ennnemis, is not possible.