Chris! I have one question, if one player use speak with dead on a corpse, and his specter form is next to them, what happens there?

— 愚人 (@MartinAleja) May 30, 2017

The presence of the specter doesn't prevent the spell from working, if that's what you're asking. #WOTCstaff https://t.co/VUX7T9AW6m

— Christopher Perkins (@ChrisPerkinsDnD) May 30, 2017

Corpse and Specter speak in unison?

— favstar bot🌹 (@megalonyx_) May 30, 2017

Specters can't speak (Monster Manual, p. 279). The DM can decide otherwise, of course. #WOTCstaff https://t.co/wprQDohasy

— Christopher Perkins (@ChrisPerkinsDnD) May 30, 2017