09-23-2016, 03:46 AM
It could create anything including a dragon as long as it stays within the five 10' cubed area but the illusion wouldn't have any sound. It would be up to the DM exactly how they react to the Dragon. I would imagine if a dragon suddenly jumps out it could freak them out and maybe even run away but once the initial shock was over with they would wonder why a dragon is there; why there isn't any sound; why isn't it pursuing them; etc?