@JeremyECrawford Question! If an undead monster, is concentrating on a spell, and a Cleric uses Turn Undead on that monster…. does that monster make a concentration check? Does it automatically break? Or does it continue concentrating as normal?
— Bryant Smith (@BrontSmoth) February 10, 2018
I thought Turn Undead essentially operates as a fear spell. Wouldn’t the Undead being forced to leave break his concentration? The tweet you're responding to contains the answer to your question.
— Jeremy Crawford (@JeremyECrawford) February 10, 2018
No worries!
— Jeremy Crawford (@JeremyECrawford) February 10, 2018