The Oreshnik isn't that special. Its basically a medium range ballistic missile akin to an ICBM, but at lower max velocity. It was supposed to scare the West (particularly Europe) with its accuracy and velocity - i.e. we can hit your cities dead center with something you can't defend against. When that didn't happen there wasn't any point of sending more.
BTW it didn't actually have warheads on board, as it is intended to have nuclear warheads. So the damage was purely kinetic