@JeremyECrawford If I cast Haste, can I take a second action on the very same turn or does it not take effect until next round?

— Skarlman (@BadSkarl) October 9, 2015

Haste takes effect immediately. You can cast it on yourself and take the extra action on the same turn. #DnD https://t.co/0qLICmkAAX

— Jeremy Crawford (@JeremyECrawford) October 14, 2015

@ChrisPerkinsDnD when going to someone's house to play DnD for the first time are there things you'll need to being with you?

— FireflyArc (@FireflyArc) November 19, 2015

Your imagination, your character, and your dice. Maybe your own rulebooks and a pencil. https://t.co/rYohGo1eIL

— Christopher Perkins (@ChrisPerkinsDnD) November 19, 2015

Come see me at @GaymerX next month! I'll be there on Saturday, December 12. https://t.co/OnrDtc6SMD

— Jeremy Crawford (@JeremyECrawford) November 23, 2015

Get your #tickets @GaymerX #everyonegames #rpg #videogames #geek #gamer #gaming #gamedev #indiedev #gaymer pic.twitter.com/UTjsZIm1PV

— GM Tim (@jogtim) November 21, 2015

@ChrisPerkinsDnD which of the old school settings would you like to see make a returnto the product line? For me it is Al-Qadim

— Trevor J Edgar (@tjedgar) October 6, 2015

Spelljammer is too "out there" for most folks, so I'll say Planescape (which is touched on in the core rulebooks). https://t.co/vVcbp7xcFq

— Christopher Perkins (@ChrisPerkinsDnD) October 6, 2015

@ChrisPerkinsDnD @tjedgar 5e love for Planescape would be awesome

— Donnie Kendall (@dwkendall) October 6, 2015

We put modrons in the MONSTER MANUAL just for you, although granted, they were around long before Planescape. https://t.co/h6yBypFThr

— Christopher Perkins (@ChrisPerkinsDnD) October 6, 2015

@ChrisPerkinsDnD @tjedgar it's likely my players are going to be visiting Sigil soon(ish).

— Donnie Kendall (@dwkendall) October 6, 2015

I had a story idea that would've blown away a big chunk of the "donut city." Luckily, that idea died on the vine. https://t.co/8A9mNdS7R9

— Christopher Perkins (@ChrisPerkinsDnD) October 6, 2015

@ChrisPerkinsDnD Did the Lady of Pain get hungry and take a bite out of Sigil?

— kired (@Kired25) October 6, 2015

The Lady of Pain is mysterious and inscrutable. Also pointy. https://t.co/MFcLmIXn4r

— Christopher Perkins (@ChrisPerkinsDnD) October 6, 2015

@ChrisPerkinsDnD @tjedgar I remember hearing about spelljammer when I was a kid. never played. Though I always wanted to.

— Malanthor (@Malanthor) October 6, 2015

ORCS … IN … SPACE!!! https://t.co/vumZXZy7X6

— Christopher Perkins (@ChrisPerkinsDnD) October 6, 2015

@ChrisPerkinsDnD Will we ever see another Spelljammer book?

— Operation Just Claus (@drwenski) January 2, 2016

Can't say, but I'm a longtime fan of the setting. I ran a Spelljammer campaign that lasted for 5 years. https://t.co/f0Uh3njBva

— Christopher Perkins (@ChrisPerkinsDnD) January 2, 2016

@JeremyECrawford If I Incapacitate (Hypnotic Pattern) a flying creature unsupported by magic/hover, does it crash to the ground?

— Edward Krusling (@EdKruze) September 25, 2015

A flyer falls if its speed is reduced to 0 and it isn't hovering or being held aloft by magic (PH, 191). #DnD https://t.co/Asbr2NjzjX

— Jeremy Crawford (@JeremyECrawford) October 6, 2015

@JeremyECrawford Does incapacitate qualify? An incapacitated creature has no movement actions, but its speed isn't specifically changed to 0

— Edward Krusling (@EdKruze) October 6, 2015

Being incapacitated doesn't immobilize you. #DnD https://t.co/gxHlMyVk4D

— Jeremy Crawford (@JeremyECrawford) October 14, 2015

@EdKruze Going back to your original question, hypnotic pattern does reduce your speed to 0, so if you're flying, the spell can drop you.

— Jeremy Crawford (@JeremyECrawford) October 14, 2015

@ronin_sama @Wizards_DnD @matthewmercer @JeremyECrawford a creation myth is great for setting the tone of your world.

— Siegfried (@siegferret) October 12, 2015

The story of my current campaign arises from the creation myth I wrote. As DM, I make my writing earn its keep! #DnD https://t.co/DoiWUFbqY5

— Jeremy Crawford (@JeremyECrawford) October 12, 2015

@Wizards_DnD Can I ask for clarification on a casting rule? Can you cast a spell while walking or running, so long as you meet requirements?

— Keith (@Glytched) October 15, 2015

You can move before/after casting a spell on your turn, speed permitting. The casting isn't part of the move. #DnD https://t.co/FWE3dX2Bpv

— Jeremy Crawford (@JeremyECrawford) October 16, 2015