Description Oscuro's Oblivion Overhaul is a very complex and extensive modification to TES IV: Oblivion. It changes thousands of variables of this excellent game and also merges into it several very popular third party modifications. It is vital that you review Oscuro's Oblivion Overhaul is a very complex and extensive modification to TES IV: Oblivion. It changes thousands of variables of this excellent game and also merges into it several very popular third party modifications.