@JeremyECrawford
I have a question about the Geas spell in 5e. Can a creature effected by the spell disobey as much as they wish, but only get punished once a day, or they can only disobey once a day at the price of the damage, and the rest of the time must fulfill the command?

— Kailor Rangorn (@KailorRangorn) December 7, 2017

The geas spell deals its damage only once per day, no matter how often the target disobeys. #DnD https://t.co/txLRMTI8LB

— Jeremy Crawford (@JeremyECrawford) December 7, 2017

Can a spell with a range of "Self" be stored in a Ring of Spell Storing?

— Armando Doval (@armando_doval) January 3, 2018

When you store a spell in a ring of spell storing, you touch the ring, effectively ignoring the range specification of the spell. Later when you cast the spell from the ring, the spell's range becomes relevant. So yes, you can store a "Self" spell in the ring. #DnD https://t.co/iLJLMVXIx6

— Jeremy Crawford (@JeremyECrawford) January 3, 2018

@JeremyECrawford
This gets asked a lot but I’ve never seen a conclusive answer.
Does Undying Sentinel, the level 15 Oath of the Ancients paladin feature, prevent death from old age?
RAW it should, but there are some who argue otherwise. Please help put this issue to rest. pic.twitter.com/8MzrwIuhh8

— Henry Wall (@HenryWa01128026) December 8, 2017

The Undying Sentinel feature protects you from the drawbacks of old age, including dying of old age. You can still be killed, but not by the accumulation of years. #DnD https://t.co/brRivBxecd

— Jeremy Crawford (@JeremyECrawford) December 8, 2017

Thank you so much for your help, keep up the good work! ❤️ My pleasure!

— Jeremy Crawford (@JeremyECrawford) December 8, 2017

@JeremyECrawford Dungeon
Delver feat. Can you gain its benefits while traveling in forests, swamps, cities, castles, etc

— Ash (@nirvanstryder) December 15, 2017

None of the benefits conferred by the Dungeon Delver feat require you to be in a dungeon. #DnD https://t.co/Y6NC2Yrfqx

— Jeremy Crawford (@JeremyECrawford) December 15, 2017

@JeremyECrawford Does Heat Metal have more than one damage roll? Does Fire Shield have more than one damage roll?

— Eric Green (@quadhund) December 13, 2017

My guess is that Fire Shield has multiple rolls (each time you are hit, roll). However, Heat Metal specifically says "on each of your subsequent turns to cause this damage again." It is unclear if this damage is intended to be 2d8 or what the initial 2d8 damage was.

— Eric Green (@quadhund) December 13, 2017

Yes, roll again.

— Jeremy Crawford (@JeremyECrawford) December 13, 2017