Going All Out.

He can even become strong enough to resist the great mother himself thanks to the supply of divine life energy and Origin energy he is getting from others. So his situation is not entirely hopeless. 

He thought to himself, "How about using the black hole to resist the great mothers?"

He thought about going out of the feeding ground and dragging the great mothers into the black hole. But he didn't do it because it is too dangerous and it would reduce the time the black hole will stay in the spiritual dimension. 

The black holes last long in the spiritual dimension because the healing of the fragmented Origin god takes time when it is only absorbing unaware soul fragments and weak soul prowlers. It won't take long to heal if it absorbs a lot of strong soul prowlers.