So a couple of friends and I are playing a campaign we created for fun. Issue is we are working on balancing characters out. The problem is we aren't sure if enemies may use both actions (not the bonus action) to attack. For example, can a bandit use both actions to perform 2 melee attacks with his scimitar. I once heard you need the action multi-attack to perform 2 attacks but another friend told me as long as the creature attacking is considered "an intelligent creature" he can perform two attacks like that.
You choose one action
Every monster will have an Actions section. This will detail all the possible actions that a monster can use its action for on its turn.
If a monster can attack more than once, this will be listed as a specific 'Multiattack' action which will say something like:
Multiattack. The dragon can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.
Each of the individual attacks, such as the bite and claw in the above example, will be listed separately. But if there is no 'Multiattack' action then you can only choose one.