@JeremyECrawford A save is DC15 and has extra effects if failed by 5 or more, does that mean at 9 or at 10? Technically 14 is the 1st fail.
— (((Canadian DM))) (@CanaDutchian) November 29, 2016
If something happens when you fail a check by 5 or more, it happens when the check total ≤ DC – 5. #DnD https://t.co/Y9OObAD0KK
— Jeremy Crawford (@JeremyECrawford) November 29, 2016