The use of my invulnerable superhero as a battering ram ended when the dragon swung him, head first, in to a magical metal pillar. The GM ruled that his head came clean off. Despite being invulnerable I had created my character with some very obvious and exploitable flaws, however, after this I determined that playing with munchkins required stooping to a bit of munchkinism. Meet my next character: The Demigod son of Loki, who turned to good by becoming an Apok. Magic, Psionics, teleportation..... To know how truly silly that character was would require a fair bit of knowledge of the game, and its expansion books.