I’ve thought of an idea that the spirit of the abyss is a Rogue Ori who creates the Magog to be his personal army but instead of bringing religion he wanted to bring destruction. The Magog worship him anyway so. The Route of ages was said to connect to different Universes. The Magog would destroy the stargate SG1 and Atlantis worlds, I believe they would even bring the Star Trek universe to there knees but that would be a harder battle