@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

@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

@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

@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

@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

@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