The sewers of Waterdeep, what’s an “unlockable grating”?

You wouldn’t happen to recognize this heraldry, would you?

Can a wiz target empty air with fireball?

If you cast a spell from a magic item, is concentration required?

Baldur’s Gate Avernus concept art

Does the rule on casting a spell with a bonus action stop a druid…

If you go to 0HP can you short rest after an hour and spend hit dice if you have them?