@JeremyECrawford do the Underdark races have their own languages or are they just variations of the surface language?

— Merlin252 (@Merlin2527) December 13, 2016

The Player's Handbook and Monster Manual state what languages various peoples speak. The languages are described in the PH (p. 123). #DnD https://t.co/lbCvmmtSki

— Jeremy Crawford (@JeremyECrawford) December 13, 2016