[RPG] Fighter War Magic, Using Booming Blade / GFB

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If my Fighter (Eldritch Knight) use War Magic (PHB p. 75) to use the cantrip Booming Blade, will I be able to use my Extra Attack, and bonus action attack, to make 3 attacks at level 7?

Best Answer

No you cannot use Extra Attack with Booming Blade

All definitions of Extra Attack say something like (Fighter text quoted):

Beginning at 5th level, you can attack twice, instead of once, whenever you take the Attack action on your turn.

Booming Blade is a spell and it requires you to take the Cast a Spell action - the Cast a Spell action is not the Attack action.

The reason you can attack with your weapon while taking the Cast a Spell action is that it is part of the Booming Blade spell:

As part of the action used to cast this spell, you must make a melee attack with a weapon against one creature.

Yes, you can use your Bonus Action to attack with War Magic

when you use your action to cast a cantrip, you can make one weapon attack as a bonus action.

There are no limitations on they type of action you must take or on the effects the cantrip has.

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