If you had a player w/a Giant Poisonous Snake as a #DnD Beast Master companion & they came into contact w/Yuan-ti would it be immune to the charm ability? #WotCStaff @JeremyECrawford

— B Lynn (@DaddyDM) October 10, 2019

The Ranger's Companion feature doesn't make the beast companion immune to the charmed condition.

If a rule confers immunity, resistance, or another special ability, that rule explicitly says so. #DnD https://t.co/2aGl53esNp

— Jeremy Crawford (@JeremyECrawford) October 10, 2019

In D&D if you see one raptor then the ones hidden in the bushes are automatically spotted too?
You cannot have a “clever girl” moment when in raptor territory, truly the darkest timeline.

— Johnspookalypse (@johnpocalypse) October 10, 2019

Spotting one creature in D&D doesn't mean you've spotted anyone else. If you and your foe spot each other before fighting, neither of you is surprised. The fact that you're not surprised doesn't make you magically aware of other creatures who might be hidden in the vicinity. #DnD https://t.co/MzpTyBfAU5

— Jeremy Crawford (@JeremyECrawford) October 10, 2019

Want to hear all about D&D combat, initiative, surprise, and almond croissants? Then give a listen to our latest episode of Sage Advice: https://t.co/TTYrEeTurL via @YouTube @Gregtito #DnD

— Jeremy Crawford (@JeremyECrawford) October 2, 2019

Can I cast a fireball while blinded? Yes.

— Jeremy Crawford (@JeremyECrawford) October 4, 2017

How do you “point your finger to a point you choose within range” if you can’t see that point? You point towards it and specify a distance. "That way, 50 feet" *fwoosh*

— Dan Dillon 👥 (@Dan_Dillon_1) July 23, 2019

How do you know you’re not 10 feet from a wall if you are blind? If you can’t see a “point” I don’t know how you aim to the point. This caught my eye because I recently played with a DM who cast fog cloud on our party and the battlefield and ruled it foiled our fireball plans. I guess to your point, though, the text of the spell does not indicate “a point YOU CAN SEE” like some other spells do.

— DM Dad (@HoosMartin) July 23, 2019

Correct, it doesn't and that's quite deliberate.

To speak to your wall point, check out "A Clear Path to the Target" (PHB pg 204). If you accidentally try to shoot a fireball through a wall right in front of you… kablooey!

— Dan Dillon 👥 (@Dan_Dillon_1) July 23, 2019

@JeremyECrawford Hi, I recently DMed for a WotC sponsored video series with Viva La Dirt League and in the newest episode I allowed Hold Person to work on a mummy and a skeleton. The comments are blowing up in debate over whether it should work or not. Does nothing hold undead?

— Robert Hartley (@RobHartley007) August 12, 2019

Hold person works only on creatures that have the humanoid creature type. Undead is a different type.

Hold monster works on any type of creature, except undead.

These are two of the reasons people in D&D worlds value clerics and their Turn Undead ability. #DnD https://t.co/fTCm86G9wE

— Jeremy Crawford (@JeremyECrawford) August 13, 2019

Can a monk attack from range with a light crossbow then run into melee range, expend a ki point and use Flurry of Blows? More specifically, does the word "immediately" in the Flurry of Blows description preclude this from happening?

"Flurry of Blows
Immediately after you take the Attack action on your turn, you can spend 1 ki point to make two unarmed strikes as a bonus action."

— Pessimistic Jack (@Philosopotter) July 31, 2019

The word "immediately" precludes it from happening.

— Jeremy Crawford (@JeremyECrawford) July 31, 2019