I believe he did let off a very powerful bomb...maybe a light bomb...but they talk about this bomb in one of the grimore cards I just can't find it...anyway this bomb could be powerful enough to create a singularity...idk I'm grasping at straws.
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The thing behind bombs is...Once you make one, what stops you from making more? How do our ships warp drives work is that ever explained? Maybe we do have gravity drives of some sort.
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To understand if he used a bomb powerful enough or with the intent to create a singularity we need to know what the darkness is. Could the darkness fill a black hole, neutralize it, eat it....or is the darkness an invisible force...we know RAS fought it so it has to be physical...we also know that we have seen forms of the darkness in the darkness zones...you know the little skwiggly black stuff that swallows the screen.