@JeremyECrawford
Tempestuous Magic.
Usable if Speed=0?
Affected by features that affect Speed?
Usable if you have already used Movement = your Speed that turn? 3— Dave Williams (@DaveWil33) August 1, 2018
A rule refers to your speed if your speed is relevant to how that rule works.
For example, Tempestuous Magic allows you to fly up to 10 feet. The feature makes no mention of your speed, so your speed is irrelevant to it. #DnD https://t.co/t8CPdebHHe
— Jeremy Crawford (@JeremyECrawford) August 1, 2018