@JeremyECrawford 'Nondetection' spell. Can it prevent 'See Invisibility' spell? Does it prevent all divination magic?

— Pavel (Ankheg) (@silvester_boots) October 7, 2016

The nondetection spell hides you from divination magic. See invisibility is a divination spell. #DnD https://t.co/pBLhSdKFLP

— Jeremy Crawford (@JeremyECrawford) October 8, 2016

How do bonus action spell rules go when a noncantrip is cast as a single action then a bonus action spell?

If you cast a spell of 1st-level or higher with 1 action, you can't then cast a bonus action spell. #DnD https://t.co/gXVPr4Xtk5

— Jeremy Crawford (@JeremyECrawford) January 29, 2016

@warderbradBut this is not how the rules read, is there Errata to address that? The rule says you can't cast a bonus action spell and a noncantrip (a spell of 1st level or higher) in the same turn (PH, 202).

— Jeremy Crawford (@JeremyECrawford) January 29, 2016

do you have to manipulate cost components if you have a focus?

— Zasabi (@zasabi7) June 26, 2016

Having a spellcasting focus is irrelevant to a spell that requires a component with a cost. #DnD https://t.co/9t94JdE9tX

— Jeremy Crawford (@JeremyECrawford) July 21, 2016

@JeremyECrawford master, if a character has multiclass(wiz 12/fighter 1) can he level up both classes to 20?

— Blima (@Andreblima21) September 22, 2016

The maximum character level is 20. If you multiclass, your levels in all your classes can add up to a number no higher than 20. #DnD https://t.co/goBFQghxou

— Jeremy Crawford (@JeremyECrawford) September 22, 2016

@Andreblima21 You're welcome!

— Jeremy Crawford (@JeremyECrawford) September 22, 2016

@konafusiona 20th lvl fighter with haste and 2-W fighting can make 6 attacks per round, right? Then action surge for 1 or 4 more? Yes, and Action Surge does let a fighter use Extra Attack again.

— Jeremy Crawford (@JeremyECrawford) February 3, 2016

@JeremyECrawford What about the additional action from a Haste spell? If used to attack, does extra attack get added to it as well?

— Ambryn (@konafusion) February 5, 2016

The haste spell states that you can make only one weapon attack with the action it provides. #DnD https://t.co/tR7JKfpvYa

— Jeremy Crawford (@JeremyECrawford) February 17, 2016

@JeremyECrawford The advantage of assassin, against creature that hasn't taken a turn, works for the entire combat? or just surprise round?

— André (@als260502) September 26, 2016

Assassinate works only against a creature that hasn't taken a turn yet. #DnD https://t.co/C1bBoaOHb5

— Jeremy Crawford (@JeremyECrawford) September 27, 2016