Do Drow PCs know Undercommon? What about the Drow Sign Language?

What would the damage type of crushing ocean depths be?

Do I need to read the entire book to run an official adventure?

A blinded Character wants to use Create Bonfire on a target…

If a reaction is taken on your turn, is the reaction part of your turn or separate?

So Grapple, a “Special Attack” is not an attack?

Can Centaur climb a ladder?