My table is split on drau/dro. But that's the one work I never try to correct their pronunciation on. Funny, the guys who say "dro" are the ones who pronounce half the rest of the creatures wrong. "Droogar" is the one that drives me crazy the most.
Anyway, this pronunciation guide is awesome. They used it last night.
According to Tim Kask, the creator of the monster, bulette is pronounced wrong.
Wizards of the Coast owns the creatures and established the pronunciation for the game as it is today.
This is a guide - you are absolutely free to pronounce these words as you and your table want to!
I would argue that even in the video he mentions that "anti-French sentiment" was popular at the time, so that could be argued as an "archaic" (1970's!) pronunciation. But yeah, as others have said in this thread, feel free to interpret as your own!
I was delighted to read that "duergar" comes from old Scandinavian "dvergar," and so I use the "dvergar" pronunciation in my own group. "Doo-where-gar" is too silly sounding for me. And I can't help but pronounce "dvergar" like Floki from Vikings, with a little spittle every time. "Chreeestian!"