@JeremyECrawford do you need line of sight to cast counterspell on a creature? Or if you hear it using verbal components, is that enough?

— Jason Austin (@JasonAu40737688) September 26, 2016

Counterspell: take a look at the "Casting Time" entry. You need to see the creature casting the spell. #DnD https://t.co/tVDvXnSG74

— Jeremy Crawford (@JeremyECrawford) September 27, 2016

@JeremyECrawford Follow up: any way of knowing which spell is being cast? eg avoiding using your Counterspell on an Acid Splash

— Conor (@IcecreamGenius) September 27, 2016

My rule of thumb: if you perceive a spell being cast (V, S, or M) and it's on your spell list, you know what spell it is. #DnD https://t.co/BzkGO7ZZLT

— Jeremy Crawford (@JeremyECrawford) September 27, 2016

@JeremyECrawford Spell list as in your own personal list or the list for your class?

— Jordan Severns (@Jordan_Severns) September 27, 2016

My rule of thumb: if a spell is on your class's spell list, you can identify it when you perceive it being cast. #DnD https://t.co/OUKB7S9yOT

— Jeremy Crawford (@JeremyECrawford) September 27, 2016

@mikemearls @JeremyECrawford Does casting a spell from a scroll, wand, etc. trigger arcane ward? Can magic item spells be twinned?

— Eric Wykoff (@edge2054) October 28, 2014

Arcane Ward/Twinned Spell works when you cast a qualifying spell. It even works when an item says you cast one. #DnD https://t.co/KU1LXVqJIV

— Jeremy Crawford (@JeremyECrawford) August 27, 2016

@JeremyECrawford creature is under effects of Non-Detection and Invisibility. Would See Invisibility work? Or blocked by Non-Detection?

— David Pozorski (@DavidPozorski) August 11, 2016

Nondetection foils divination spells, such as see invisibility. #DnD https://t.co/O96Hg3elBd

— Jeremy Crawford (@JeremyECrawford) August 12, 2016

@Ulm01Have a bag o tricks and it’s been hilariously broken. Can it indeed be 3 concurrent creatures until dawn? Errata says yes? Three creatures—that's correct.

— Jeremy Crawford (@JeremyECrawford) August 30, 2016

@JeremyECrawford can someone use comprehend languages or a similar spell to understand Thieves' Cant?

— John (@TheOfficialZIN) September 9, 2016

Comprehend languages reveals literal meaning. Thieves' cant is all allusion. Result: misleading translation #DnD https://t.co/iX5VDHOp1J

— Jeremy Crawford (@JeremyECrawford) September 9, 2016

@JeremyECrawford darmok and jilad at tenagra. fafhrd and the grey mouser, taking the dogs for a walk.

— adam koebel (@skinnyghost) September 9, 2016

@skinnyghost That's exactly it!

— Jeremy Crawford (@JeremyECrawford) September 9, 2016

@RMHWilde Can wiz move 30ft w/action then dash action for 30′ then bonus action cast expeditious retreat to dash/move 30ft more=90′? Yes.

— Jeremy Crawford (@JeremyECrawford) October 18, 2016

@trace400Does ‘incendiary cloud’ move directly away from you, or in a direction you choose? Check out the final sentence of the spell for the answer.

— Jeremy Crawford (@JeremyECrawford) July 21, 2016

@trace400So it does both, then? But ‘directly away from you’ doesn’t give you much of a choice, does it? There’s a reason I asked. You choose its heading.

— Jeremy Crawford (@JeremyECrawford) August 2, 2016