The Marilith, Goristro, and Balor are familiar, so are the Ice Demon and Pit Fiend...
Kraken is heard of, but what kind of monster is the Tarrasque? Sounds like it might be quite formidable.
I understand the Beholder, Death Kiss, and Death Tyrant, but are there really such things as the Nest Mother's Eye and the Elder's Eye?
Is it possible that monsters no one recognizes simply never existed from the start? The monsters could be made up, along with their strengths and weaknesses – hearing it for the first time, it's not impossible that it seems plausible.
That fool Cecilia exposed herself by mentioning the Green Dragon, Green Hag, and Evil Ghost before, is it possible that this tipped off that guy to everyone's identities, stunning everyone when he blurted it out and causing us all to lose our ability to judge?
All in all, the man was just too good at pretending – acting just like a peerless master living in seclusion in the Primitive Forest.
