When a monster multiattacks, do you roll to hit for each piece of the multiattack, or just one roll to hit with all of the pieces?
If a rogue uses Uncanny Dodge, would they take half damage of the entire multiattack, or only one piece?
Uncanny Dodge: Starting at 5th level, when an attacker that you can see hits you with an attack, you can use your reaction to halve the attack’s damage against you.
If a player has Sanctuary on them, would the monster have to roll DC WIS to attack with each individual piece or just once to hit with the whole multiattack?
Sanctuary: You ward a creature within range against attack. Until the spell ends, any creature who targets the warded creature with an attack or a harmful spell must first make a Wisdom saving throw. On a failed save, the creature must choose a new target or lose the attack or spell. This spell doesn’t protect the warded creature from area effects, such as the explosion of a fireball. If the warded creature makes an attack or casts a spell that affects an enemy creature, this spell ends.