@glbrogdoniv howdy, does the duelling fighting style work with sword and shield? "does the duelling fighting style work with sword and shield?"

It sure does!

— Jeremy Crawford (@JeremyECrawford) January 21, 2015

@iDungeonMasterdo dragons have fly by attacks? or just move, attack then finish their move? do they suffer AoO "do dragons have fly by attacks?"

A stat block tells you if a monster has a special flyby, as in the spined devil.

— Jeremy Crawford (@JeremyECrawford) January 21, 2015

@BrailSayslvl 14 illusory reality+illusion of adamantine wall, incoming siege boulder/ballista. What happens? "lvl 14 illusory reality+illusion of adamantine wall, incoming siege boulder/ballista. What happens?" It could hit the wall.

— Jeremy Crawford (@JeremyECrawford) January 21, 2015

@BrailSays "wall hp? no damage ?" The wall is real, so the DM would treat it like any other wall.

— Jeremy Crawford (@JeremyECrawford) January 21, 2015

@SoulofTwhitMulti Multiclass Eldritch Knight and Arcane Trickster: chapter 6 says slots as 1/3 lvl of chart, rounded down. Class lists use 1/3 rounded up, eg lv3 spell @ 13? Use chapter 6's calculation for your fighter/rogue's spell slots.

— Jeremy Crawford (@JeremyECrawford) January 21, 2015

@KoontzA player with multi attack readies an attack, do they get all attacks on the trigger or just one If you mean the Extra Attack feature, the extra attacks happen only on your turn.

— Jeremy Crawford (@JeremyECrawford) January 21, 2015

@MikeGBensondoes a player using the polearm master feat add strength to the damage roll of the bonus attack? "does a player using the polearm master feat add strength to the damage roll of the bonus attack?"

Yep!

— Jeremy Crawford (@JeremyECrawford) January 21, 2015

@JamesMusicusHi Jeremy, I was wondering about the wording of Fighting Styles in 5e. Can you have more than 1 from multiclassing? "I was wondering about the wording of Fighting Styles in 5e. Can you have more than 1 from multiclassing?" Yep!

— Jeremy Crawford (@JeremyECrawford) January 21, 2015

@calebrus44 Debate resolution. Druid in wildshape. Keep prof bonus to attack or use beast’s stats unmodified? A druid in beast form uses his or her proficiencies, except when the beast has the same proficiency with a higher bonus.

— Jeremy Crawford (@JeremyECrawford) January 21, 2015

@calebrus44That doesn’t answer the Q. Druid is not prof in claw/bite. Black bear form, +3 for bear, or prof+2 for druid w/ bear str? The intent is that the druid uses the bonus in the beast's stat block for any proficiency the druid lacks.

— Jeremy Crawford (@JeremyECrawford) January 22, 2015