the fact that nosgoth is in a completely different series to FF, there is no way in hell that seph could do that...also, he cant fly in space 😬
thats the whole point of the FF7 movie..
anyways, its irrelevant..the fact is that seph cant do any to the elder god, even if he could see him...which he cant 😬
theres no incarnation of Sephiroth that would have a stones throw of chance of winning against a kain without the number of powers Furion took off kain in that Sephiroth VS thread, a move of his hand and Sephiroth is frozen in time, game, set and match
but this is EG, Kain is not in this match, nor is the reaver and Sephiroth is hopelesss and helpless to do anything at all, blowing up the planet will not kill EG, hes part of several planes of excistence at once, why would blowing up one planet of one plane he is on do anything?