Colossal

Large monsters get no respect.  At least not in fantasy games.  In modern settings there a little bit of a big deal.  Especially when they're the only one and all you have are little tanks and planes whose weaponry can't penetrate its hide.  You know, unlike those magic swords that the fantasy heroes have.  Sadly the Colossal size category went away in 4e D&D but who knows, it might be back next go around.

Art from here
LooneyDM out