Sorry for bothering with so many tweets of the same question, But do u see the PHB+1 rule for AL expanding due to new BooksThe PH + 1 rule in Adventurers League is here for the foreseeable future.
— Jeremy Crawford (@JeremyECrawford) October 23, 2017


Prismatic Wall: can I create an hemispherical dome?
@JeremyECrawford @JeremyECrawford Can I create an hemispherical dome (on the surface of the ground, thus the sphere goes into the ground) with Prismatic Wall?
— Draconis (@DerynDraconis) December 11, 2017
Prismatic wall can effectively be a hemisphere if you create the sphere version and place its center close enough to the ground or another obstruction. #DnD https://t.co/biY3s0OYWr
— Jeremy Crawford (@JeremyECrawford) December 11, 2017

Can you set a permanent circle of teleportation on a moving structure like a ship?
@JeremyECrawford Can you set a permanent circle of teleportation on a moving structure like a ship? Is the spell bound to a location in space or the object it is cast on?
— Derrick (@Scyllan8) December 13, 2017
When you cast teleportation circle, you create the circle on the ground. The circle is bound to that surface, not to a point in space. #DnD https://t.co/flXBIuuVKe
— Jeremy Crawford (@JeremyECrawford) December 13, 2017
Ground not limited by axis….allows players to cast circles on walls (vertical ground). Hence the teleportation room…..Saying that a wall is the ground defies the idiomatic meaning of the word "ground." But a DM is free to allow bonkers things.
— Jeremy Crawford (@JeremyECrawford) December 13, 2017
And here "ground" could mean "deck of ship" or "place on Morloth's island" or other thing capable of motion?
— DM Dean has resolve but no resolutions (@DeanMSimmons) December 13, 2017
The DM decides how generously to interpret words like "ground." Unless we redefine or focus a word, we use it in its idiomatic English sense, knowing that some words are open to creative interpretation. #DnD https://t.co/YMTSyMgKYt
— Jeremy Crawford (@JeremyECrawford) December 13, 2017
Does that mean you could conceivably cast it over the course of a year on a surface like a wooden deck and then hang the deck off a building or upside down so people teleporting in then fall? That’s up to the DM.
— Jeremy Crawford (@JeremyECrawford) December 13, 2017
Could I cast it on a very large blanket then fold it up and take it on the road with me? Only if your DM thinks a blanket counts as ground.
— Jeremy Crawford (@JeremyECrawford) December 13, 2017

Feat Second Chance, does the halfling’s get to choose which roll is used?
Feat Second Chance (XGTE p. 75): The feat does not specify what happens after the attacker is forced to reroll. Does the halfling’s get to choose which roll is used? Does the attacker have to use the new roll (5% chance reroll is a crit)? Is the lower roll used? The attack is rerolled, thereby negating the previous roll, and using the new roll. If there was a choice between rolls, the text would say so.
— Eric Green (@quadhund) January 18, 2018
You're spot on, @quadhund.
— Jeremy Crawford (@JeremyECrawford) January 18, 2018

How Illusionist malleable illusions ability interacts with Simulacrum?
@JeremyECrawford I’m trying out an illusion school wizard and was wondering how their malleable illusions ability interacts with simulacrum? Also, does malleable illusions work on illusion spells replicated via wish? #DnD
— Jimothy (@JimothyVS) January 22, 2018
Some spells, like minor illusion and mirage arcane, create illusions with perceivable attributes that you set: a blue chair, a lion's roar, etc. Malleable Illusions lets you tweak those characteristics. A spell like simulacrum doesn't contain such changeable characteristics. #DnD https://t.co/LqweLg244T
— Jeremy Crawford (@JeremyECrawford) January 23, 2018

Question can you target an enemy with the spell Meld into Stone?
@JeremyECrawford Hey! Question can you target an enemy with the spell Meld into Stone? Example: pushing them into a wall of a dungeon. If so how would you rule it?
— Jordan Dowell (@Jordan0Dowell) January 25, 2018
Meld into Stone affects only the caster and the stone the caster touches. If a spell allows you to target others, it defines for you whom you can target. #DnD https://t.co/opikqnANN4
— Jeremy Crawford (@JeremyECrawford) January 25, 2018

What happens if you are hidden and you cast with Subtle Spell a spell that involves a saving throw?
@JeremyECrawford Unseen Attackers (PH, 194–5): works with attack rolls if you are hidden.
But what happens, if you are an hidden Sorcerer with Subtle Spell, and you cast a spell that involves a saving throw? Are you still hidden? Can you cast an hidden Fireball or Charm Person?— Draconis (@DerynDraconis) January 12, 2018
If hidden, you stop being hidden if you make appreciable noise (including the verbal component of a spell), you make an attack, or you're spotted. If you cast a spell that involves none of those stoppers, you're still hidden. #DnD https://t.co/epMrRT2rL8
— Jeremy Crawford (@JeremyECrawford) January 12, 2018

Is a creature that is immune to grappling also immune to shoving?
@JeremyECrawford is a creature that is immune to grappling also immune to shoving? I.e specter, wraith, shadow? #dnd #dnd5e
— Justin Ray Glosson (@ivstinus) December 19, 2017
Grappled is a condition, and some creatures are immune to it. Being shoved isn't a condition, and there is no standard immunity to it. #DnD https://t.co/65konJaLLf
— Jeremy Crawford (@JeremyECrawford) December 19, 2017