@Lord Erphius Fogg
Nominal ruler of Shadowhearth. Human, 50s, Common and bad Elvish only.
Reputation: Sniveling snake who ignores duties to read forbidden books in tower. The Castle Haunt.
Truth: Found original Magister ledger with dragon sketch and "THE MOTHER REMAINS." Knows something under castle poisons everything. Desperately trying to translate Old Draconic and Deep Infernal with dictionaries. Getting 70% wrong. Tower full of half-finished notes.
Role: Not truly an adversary - obstacle and potential ally. If party helps translate, he can point to crypt. If ignored, his mistranslations make things worse.