@Tim_Dowd can one be hurt by an illusion, and if so, can they heal when they realize the fireball was fake? Most illusion spells deal no damage, regardless of what they depict. If one deals damage (see phantasmal force), the dmg. is real.

— Jeremy Crawford (@JeremyECrawford) November 15, 2014

Burning hands is both a “a thin sheet” and a cone. Which is correct? Is there an easy way to know how to resolve such contradictions? Burning hands is a 15-foot cone. To reconcile the words "sheet" and "cone" in the spell's text, one solution is imagining a waffle cone: a sheet shaped into a cone.

— Jeremy Crawford (@JeremyECrawford) February 28, 2021

I also like a triangular sheet that rotates around the center line. Et voila, cone.

— Dan Dillon (@Dan_Dillon_1) February 28, 2021

That is the fantasy equivalent of a gangster rotating their hand to hold their gun sideways. Except it would actually increase effectiveness, but sure. 😂

— Dan Dillon (@Dan_Dillon_1) February 28, 2021

@tragicjones @mikemearlsIs the bard’s Jack of All Trades feature intended to apply to initiative? PS, congrats on a spectacular launch! Yes, Jack of All Trades can apply to initiative, since that roll is a Dexterity check.

— Jeremy Crawford (@JeremyECrawford) August 21, 2014

@vamp7777so it would also apply to concentration checks No. Jack of All Trades benefits ability checks, not saving throws. @tragicjones @mikemearls

— Jeremy Crawford (@JeremyECrawford) April 10, 2015

@JeremyECrawford
Hi Jeremy. I see that features from Way of the Sun Soul has different writing on Xanathar's. I know there's an errata for the Sword Coast's version, but it still have different text and "balance".
Should we take the Xanathar's version as the most important one? pic.twitter.com/CteqIIXKtX

— Moses Lord (@MosesLord777) April 18, 2020

Sometimes when we reprint something in D&D, we refine the wording, adding clarifications and whatnot. If those clarifications result in no mechanical change, we often don't include them in an errata document.

In the examples below, the features are functionally identical. #DnD https://t.co/mhl1LlErOF

— Jeremy Crawford (@JeremyECrawford) April 18, 2020

@mikemearls @gregbilsland Can a simulacrum (per the spell) of a legendary creature use its legendary and/or lair actions?

— Jonathan Longstaff (@pukunui81) October 15, 2014

@gregbilsland @pukunui81 @mikemearls Yes, assuming you spend the 1,500 gp, and the legendary creature is within reach for 12 hours.

— Jeremy Crawford (@JeremyECrawford) October 21, 2014

@pukunui81How do you guys handle Perception for sleeping characters? Passive with -5 for disadvantage? I normally treat a sleeping character as unconscious. A good shake or loud noise can wake the sleeper. @gregbilsland @mikemearls

— Jeremy Crawford (@JeremyECrawford) January 6, 2015

@jackAbrasionIf a spell’s material components are consumed, can a spellcasting focus still be used in place of the consumed component? A spellcasting focus can't substitute for a component that is consumed.

— Jeremy Crawford (@JeremyECrawford) January 10, 2015

@ZejetyDoes this ruling also apply to component pouches? Yes. See the Player's Handbook, p. 203. @jackAbrasion

— Jeremy Crawford (@JeremyECrawford) June 17, 2015

@jaa0109 @mikemearlsDo Warlock spells granted by the Patron count against the number of spells known? A patron expands the spell list that a warlock chooses from. The warlock must choose one of those spells to know it.

— Jeremy Crawford (@JeremyECrawford) November 6, 2014