No, but there is a universal rule that has the lore outranking "in-game" feats. Something you are having trouble understanding.
Just get directly to the point next time lol.
Actually, the main questline is canon. And I don't recall a dragon ever showing continent busting force. And no. Dragonborn doesn't really one shot a mountain or a city..
Because, again you're talking about the game. That's why you never see it, and more than likely, never will.
so.. you can show me dragonborn, or any skyrim character, one shotting a nation in lore?
You do realize that will mean end of everything the game ever established, including the official cinematics?