...and I'm going to fucking give it to them. (Note: This submission is largely so I don't forget the details of this plan once I'm less pissed off.)
I can explain! Really! (Note: This is for my Demon Hunting Campaign set in 1640's Ireland, so here be campaign specific dragons.)
My take on Dracula for my 1640's Demon Hunting Game
A powerful wizard that the PCs encounter is completely silent. He does not speak and cannot be heard as he moves. Even his spells are silent, but his magic is just as potent.
He has a tendency to summon invisible chairs, place foes in invisible boxes of force, and other "mime tricks".