The name combines Nidhogg, the dragon from Norse myth who gnaws at the roots of the world tree, with the image of wolves running with thunder. That mix of myth and storm is why the clip circulates on soundboards as a compact fantasy power sound rather than a joke effect. Creators reuse it for games, edits and roleplay videos where a normal roar feels too plain, and its short length makes it easy to drop in repeatedly across streams, shorts and fan-made trailers without overwhelming the scene.