Questonite is the
invincible metal of the old
Champions RPG. Much like its counterpart
Adamantium, Questonite is impervious to anything, except things that it isn't. In fact, most Champions
superheroes can either punch through Questonite or blast through Questonite (Just like
Marvel heroes, in fact), which leaves the GMs with the problem of creating even more invincible metals for the PCs to be caged with.