Can a wiz target empty air with fireball?

Is a weapon created from the warlock’s Pact of Blade considered a magic weapon?

Is there a list of what deals half damage on a successful save?

Vampire turns into Mist, can it be dispelled?

Oozes can be grappled. Does this mean I can prevent a Gelatinous cube…

Do Winged Boots prevent falling into pits?