@JeremyECrawford Just started DnD 5e. Do I need to ready my Shield spell to use it as a reaction later in the round?

— Vanilla Gorilla (@TheVnlaGorilla) August 24, 2016

If an effect, like the shield spell or an opportunity attack, lets you use your reaction, you don't Ready it. #DnD https://t.co/zYMUxIclHW

— Jeremy Crawford (@JeremyECrawford) August 24, 2016

@TheVnlaGorilla @JeremyECrawford nope. You only need to ready things that are not normally used as reactions. #wotc staff

— (((Mike Mearls))) (@mikemearls) August 24, 2016

@JeremyECrawford Rules question. I have extra attack. Can I make 1 attack on my turn and then ready the second attack to happen later?

— MattScoville (@MattScoville) August 2, 2016

Fey Ancestry benefits any saving throw meant to stop an elf from suffering the charmed condition. #DnD https://t.co/A5KGj8vVvp

— Jeremy Crawford (@JeremyECrawford) August 2, 2016

@looneysquash I would have thought the problem was that you can’t take two actions in one turn, and Attack and Ready are each actions. That issue would kick in if Extra Attack could be used with any action other than Attack.

— Jeremy Crawford (@JeremyECrawford) August 2, 2016

@JeremyECrawford Can you ready the Attack action, and gain the benefits of Extra Attack when the trigger occurs?

— Justin Yanes (@Jyuasnteisn) August 2, 2016

@looneysquashBut can’t you Ready the Attack action (taking no other action), and then use Extra Attack with it when it triggers? Take a look at the text of Extra Attack. It's confined to your turn.

— Jeremy Crawford (@JeremyECrawford) August 2, 2016

@JeremyECrawford seems like readying cantrip better then attacking then. since cantrip throws more attacks. seems logical to allows extra.

— Luc Charette (@DnDPaladin) August 2, 2016

Readying a spell, including a cantrip, requires concentration. Readying an attack does not. #DnD https://t.co/y3NH1Uj8y5

— Jeremy Crawford (@JeremyECrawford) August 2, 2016

Also, the ongoing javelin as melee vs ranged weapon debate raged at our table last night 😛 @ChrisPerkinsDnD @mikemearls @JeremyECrawford

— Shane Plays (@ShanePlays) October 19, 2016

A javelin is a melee weapon. Melee weapons use Str. mod. for attack/damage rolls ("Attack Rolls," PH, 194). Exceptions include finesse. #DnD https://t.co/HhnmHIxClv

— Jeremy Crawford (@JeremyECrawford) October 19, 2016

@JeremyECrawford Two successful Command spells on the same target. Stop and Run. What happens next round?#dungeonsanddragons

— Hanno Ziegler (@ronin_sama) September 8, 2016

@ronin_sama @ChrisPerkinsDnD last one cast applies

— (((Mike Mearls))) (@mikemearls) September 8, 2016

The effects of the same spell don't stack; use the most potent effect (PH, 205). If equal, use the most recent. #DnD https://t.co/EuxQ9hhPJJ

— Jeremy Crawford (@JeremyECrawford) September 8, 2016

@xanderh2404 Should multiclass 3rd casters round up or down? Single-class rounds up, but multiclass rules says to round down. A multiclass character follows the rules for multiclassing.

— Jeremy Crawford (@JeremyECrawford) February 17, 2016

@xanderh2404 this means that EK multiclassing wizard doesn’t advance spell slot progression. Intended?
An EK is at least a 3rd-level fighter and therefore contributes at least 1 level to multiclass spell-slot advancement.

— Jeremy Crawford (@JeremyECrawford) February 18, 2016

@xanderh2404 20 EK has the same spell slots as a 19 EK / 1 wizard. This is what I meant. That's correct.

— Jeremy Crawford (@JeremyECrawford) February 18, 2016

@xanderh2404 That basically makes the dip worthless, though. Doesn’t feel well thought out, to be honest. If 3 cantrips, 6 1st-level spells, Ritual Casting, Arcane Recovery & a spellcasting focus are worthless to you, do avoid them.

— Jeremy Crawford (@JeremyECrawford) February 18, 2016

@JeremyECrawford actually, on that note, would the Arcane focus work with EK spells as well?

— alexander Hvilshøj (@xanderh2404) February 18, 2016

An Eldritch Knight casts wizard spells. With a level in wizard, you can use an arcane focus with those spells. #DnD https://t.co/fwh1C9uTHy

— Jeremy Crawford (@JeremyECrawford) February 22, 2016

@Hedgeson991Do swashbuckler rogues get to add their dexterity modifier to offhand weapon attacks while two weapon fighting? I'm curious, what feature in the Swashbuckler is prompting you to ask about two-weapon fighting?

— Jeremy Crawford (@JeremyECrawford) October 26, 2016

@Hedgeson991 The sidebar provides tactical advice. That is all.

— Jeremy Crawford (@JeremyECrawford) October 26, 2016

@yr43lHey, if a caster polymorphs himself, and then takes damage in the polymorphed form, does he need a concentration check? Yes.

— Jeremy Crawford (@JeremyECrawford) January 29, 2016