Ancalagon
Dusty Dragon
single class it's not broken, in fact it's a bit weak if you play them as you are "supposed" to (ie attacking with a blade). It can be a bit... hmmm... much if multiclassed, but keep an eye on that. A fighter with a short dip in hexblade (or vice versa) makes for a very interesting gish (a few levels of hexblade gives a good dash of magic to a fighter, and a few levels of fighter toughens up the hexblade significantly)