My theory is that Durge is more of an energy source for Bhaal to help reconstruct himself. A nice little fountain of murderous intent and death to keep the blood pumping while his divine energy is collecting enough for him and his buddies to gain full godhood again.
Also, when Dark Urge was announced I wondererd if that *is* CHARNAME, or rather what is left of them after Bhaal emerged and reformed. Only kept around for Bhaals amusement and as a revenge for blocking the taint for so long. ^^
I think Dark Urge could be new Kazgaroth, favorite minion of Bhaal.
Extremely powerful, bloodthirsty, intelligent and capable of changing races and shapes.
But Bhaal is still very weak and that's why even his favorite monster is still weak.
Right now he's stuck in the form of a normal humanoid and he doesn't remember what he is.
But his true nature is bubbling to the surface and trying to take control...
