@ironwizard13Can a Fighter Wizard use the Action Surge to cast a spell? Yep! The action granted by Action Surge can do any of the things an action can normally do.

— Jeremy Crawford (@JeremyECrawford) September 16, 2014

Does a cantrip only count as “cast a spell” then? A caster can’t use a cantrip on an opportunity attack?

@corymacdonaldSo wait? Does a cantrip only count as “cast a spell” then? A caster can’t use a cantrip on an opportunity attack? Correct. A cantrip is a spell.

— Jeremy Crawford (@JeremyECrawford) March 23, 2015

@corymacdonaldA cantrip being a spell doesn’t bother me definitionally. A cantrip being unusable on an OA does. I encourage creating a house rule if you want all spellcasters to be able to use cantrips for OAs. @WiscoDwarf

— Jeremy Crawford (@JeremyECrawford) March 23, 2015

@corymacdonald I didn’t realize it’d nerf War Caster. It was how I thought about cantrips. Clearly baked in. I’m good now. Excellent! @WiscoDwarf

— Jeremy Crawford (@JeremyECrawford) March 24, 2015

@BrailSaysCould we please get an official RAW ruling on +damage to Magic Missile/etc? Very heated debate about it on the reddits >_>
"Could we please get an official RAW ruling on +damage to Magic Missile/etc?" If you summarize the issue, I'll tackle it.

— Jeremy Crawford (@JeremyECrawford) January 21, 2015

@BrailSayssay you have +3 to spell damage from feature. Magic missile 3 bolts. +3 per bolt or flat +3?
"say you have +3 to spell damage from feature. Magic missile 3 bolts. +3 per bolt or flat +3?" Depends on the feature's wording

— Jeremy Crawford (@JeremyECrawford) January 21, 2015

@BrailSays evo wizards lvl 10 feature? don’t know exact words
Empowered Evocation does benefit magic missile's damage roll.

— Jeremy Crawford (@JeremyECrawford) January 21, 2015

@BrailSays+x per bolt,even on same target?
Yep. It's one damage roll, just like fireball, but that roll can damage the same target more than once.

— Jeremy Crawford (@JeremyECrawford) January 21, 2015

@ApocalypticTwitTwinned Spell: Does it need a spell that is targeting 1 creature, or a spell that CAN ONLY target 1 creature? Twinned Spell is intended to work with a spell that can normally target only one creature. @mikemearls

— Jeremy Crawford (@JeremyECrawford) December 9, 2014

@wachungaPrestidigitation has range 10 whereas cleric/druid variants (Thaumaturgy/Druidcraft) have range 30. Is this intentional? It's intentional.

— Jeremy Crawford (@JeremyECrawford) September 12, 2014

@JeremyECrawford can an attack of opportunity be used to make a grapple or a shove?

— Jon Carroll (@Joncarrollwrite) August 14, 2015

Grappling/shoving are part of the Attack action (PH, 195). Take the Ready action to grapple/shove outside your turn. https://t.co/NzAXyieuMH

— Jeremy Crawford (@JeremyECrawford) August 14, 2015

@edge2054 @mikemearlsCan a thief with the healer feat use healing kits as a bonus action? Can it drink potions as a bonus action? Yes, a thief could use a healer's kit as a bonus action. But the DMG clarifies that magic item use is its own thing.

— Jeremy Crawford (@JeremyECrawford) October 24, 2014

@edge2054 Okay, just wanted to see if potions fell under use magic item or not. I take it from your response they do. Thanks 🙂 Yeah, potions follow the magic item rule.

— Jeremy Crawford (@JeremyECrawford) October 24, 2014