Short answer: Yes, you can take a reaction before your first turn in combat. Reactions and bonus actions aren’t ever something you “have”, they’re something you do. And there is a limit on the number of times in a round that you can do them.
Can you use your action to cast a bonus action spell?
If you use a bonus action spell, you can only cast a cantrip as a “cast a spell” action during your turn. Reaction spells are usable once it’s no longer your turn, but if you need one during a turn where you’ve already cast a bonus action spell, you’re out of luck.
Can you use a reaction spell on your turn?
Can you also cast a reaction spell on your turn? You sure can! Here’s a common way for it to happen: Cornelius the wizard is casting fireball on his turn, and his foe casts counterspell on him.
Can you put a bonus action in the middle of an action?
You are taking the Attack Action and getting multiple attacks from the Extra Attack feature. However, you cannot insert a bonus action into the middle of another Action unless the bonus action says you can.
How to take advantage of bonus actions in 5e?
Having some of these up your sleeve will give you a lot of extra versatility when combat starts. For anyone that wields a weapon, the obvious way of getting more bang for your buck every single round is to fight with two weapons instead. This way you get to make an extra attack on your turn, using a bonus action.
Which is the best feat for bonus action?
Of these feats a few stand out for me. Shieldmaster for example lets you use a bonus action every time you take the Attack action, whilst Polearm Master feat is probably the best out there as it allows you to use a bonus action every round AND often a reaction too.
Can you use your bonus action while berserk?
Rules as Written and Rules as Intended agree: you can use your bonus action freely while berserking. While berserk, you must use your action each round to attack the creature nearest to you with the axe.
