Is it legal for an overlord to deliberately move his monsters over glyphs so that heroes cannot access it unless they kill the blocking monster? I know this is true of potions, but not sure about glyphs. Seem to recall somewhere that chests can also be guarded in this manner.
If it is legal, then what if all the players were in Town and all existing glyphs have been blocked? This means no one may enter anymore, and the OL wins by default due to his deck still constantly being drawn while the players are stuck in town. I was thinking that this is legal, except that it is going to take a loadful of monsters to completely block each glyph due to heroes being able to travel back to any square adjacent to the glyphs (total of 9 each)