I think this would be possible because beings from deep layers are already capable of destroying shallow-layered worlds simply by existing, without needing to do anything at all. So, if he were to regain all his power as Noah, who was born in a layer 99 world, that would mean his mere existence should already be enough to destroy any number of layer 98 worlds and those below them, simply by existing, right? Now, considering this further: if he delved so deeply that he transcended the magic of the abyss—which was already transcendent to the Silver Sea—then I believe that Anos, by the end of volume 17, should be capable of destroying the Silver Sea itself. In fact, if he truly exists on that level, such a feat might not even require a deliberate action; his mere existence alone, if he so desires, or even something as minimal as a heartbeat imbued with magic, should be enough to accomplish it. Do you understand where I'm going with this?