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You can attack multiple times in a turn unless you are doing something other than Attack. Many mobs are equipped with multiattacks and abilities which cannot be used simultaneously as the multiattack when they are more potent than just attacking for a short time. Flame breaths are an entire action in itself and cannot be changed to just one bite or include another claw after having done it. A Young Red Dragon can claw twice and bite twice or make use of its flame breath. If something is listed under actions but not part of the multiattack, this isn’t part of the multiattack. The Black Bear? They can use a multi-attack to bite and claw however, you can claw twice even though it is more efficient. You can attack using either the shortbow or scimitar but not both, or using either.
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However, the monsters always have an article with multiattacks when there is a multiattack play with. Multiattack rules in dnd 5e is used every time you encounter the monster, and you should use the multiattack every time.
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