Ranger Multiattack Defense: 2 creatures attacks, to which attacks does the +4AC apply?

Can an elf concentrate on a spell while meditating?

After Haste ends, PHB says target can’t move or take actions. Does this include reactions?

A Goblin is hidden in a bush, it attacks & then uses it’s Bonus ActionA to re-hide…

Do all of the cubes of fire from firestorm have to be contiguous?