I’m kind of disappointed that Molydeus has no art in Mordenkainen’s Tome of Foes. I have never heard of him until that point and he looks amazing and unique and a ferocious!
Any reason for some monsters to not have visual representations? I think it was added into the book after we finalized the art list for it. happens sometimes.

— Mike Mearls (@mikemearls) July 18, 2018