@JeremyECrawford a player shoots a fireball into a bunch of goblins who happened to have a nilbog with them. Does the fireball trigger nilbogism and save all the goblins ?

— Luc Charette (@DnDPaladin) February 22, 2018

If you try to deal damage to a nilbog by any means (a weapon, spell, or something else), Nilbogism is triggered. If you're unaware of a nilbog's presence and the creature is inadvertently caught in an area of effect you create, you're not subject to Nilbogism. #DnD https://t.co/OTIj4pqM1P

— Jeremy Crawford (@JeremyECrawford) February 23, 2018

@JeremyECrawford Concerning the Half Dragon Template, if applied to a beast does it stay a beast or become a monstrosity?

— Robert (@NozzaLevene) December 19, 2017

The half-dragon template doesn't change a creature's type. #DnD https://t.co/0FuIcdrzD0

— Jeremy Crawford (@JeremyECrawford) December 19, 2017

@JeremyECrawford Can a creature with multiple speeds choose which one to use to stand up from prone? e.g. Can a creature with 0 walking speed, or higher walking speed than flying speed, choose to stand using their flying speed?

— Armando Doval (@armando_doval) February 4, 2018

The rule on standing up from prone fails to account for you having multiple speeds. Here's the intent: if you have multiple speeds and stand up, expend an amount of movement equal to half your highest speed. #DnD https://t.co/bIsUZRdk0W

— Jeremy Crawford (@JeremyECrawford) February 4, 2018

That ruling still leaves room for gaming the system if you have a speed that is five to ten feet higher than another somehow. Spend half your walking movement (35 ft) and still have 30 ft of flight movement. I would just halve all speeds for getting up from prone. That scenario is covered by the rule on using multiple speeds.

— Jeremy Crawford (@JeremyECrawford) February 4, 2018

@JeremyECrawford I asked this last week and am re-asking in case you missed it. Not trying to be pushy. If you take a feat with +1 ability score, but it's already 20 can you put that score somewhere else or is it lost?

— Rocky Williams (@Williams091479) February 4, 2018

If a feat gives you an increase to an ability score that you can't raise any higher, there is no increase. #DnD https://t.co/xqcw05wnuW

— Jeremy Crawford (@JeremyECrawford) February 4, 2018

@JeremyECrawford #DnD can stone shape be used reshape parts of and kill stone creature w/o immutable form gargoyle galeb Durr etc?

— A Cardboard Sword (@CardboardNJ) February 22, 2018

The stone shape spell targets an object. A creature is not an object. #DnD https://t.co/JvHl1vaASl

— Jeremy Crawford (@JeremyECrawford) February 22, 2018

On this note, can I use create/destroy water to “destroy” a water elemental?No.

— Jeremy Crawford (@JeremyECrawford) February 22, 2018

@JeremyECrawford Underwater is no sound ?
How does thunder damage work underwater ?

— 西/Ni$hi (@carbine_gentle) February 15, 2018

Sound carries underwater. As a kid, I verified this fact by happily swimming and making noise underwater. 🧜🏻‍♂️ #DnD https://t.co/wzcMVkRqB6

— Jeremy Crawford (@JeremyECrawford) February 15, 2018

Hi @mikemearls & @JeremyECrawford Will great weapon fighting allow me to rerole both damage dice whilst using a great sword?

— Lux 🕹 (@LuxTheLad) February 27, 2018

Yes

— Mike Mearls (@mikemearls) February 28, 2018

Great Weapon Fighting applies to any of the dice of a qualifying weapon. #DnD https://t.co/HpP9jtEkWW

— Jeremy Crawford (@JeremyECrawford) February 27, 2018