Booming Blade:

You brandish the weapon used in the spell’s casting and make a melee attack with it against one creature within 5 feet of you.

Extra attack:

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

I think we can agree that Booming Blade is casting a spell (a cantrip). Obviously I can’t use Booming Blade twice.

But does the fact that it’s a spell that makes a melee weapon attack count as “taking the attack action”?

In other words - if I cast Booming Blade, am I locked out of Extra Attack because I took a “Cast a Spell” action instead of an “Attack” action? Or do I still get an extra attack because casting the spell made me take the Attack action?

  • @[email protected]English
    5•1 year ago

    The action you’re taking is Casting a Spell.

    Attack is a different action which would let you attack twice with Extra Attack.

    You cannot Booming Blade your attacks with Extra Attack.

    This is actually the topic of a Sage Advice:

    Can you use green-flame blade and booming blade with Extra Attack, opportunity attacks, Sneak Attack, and other weapon attack options? Introduced in the Sword Coast Adventurer’s Guide, the green-flame blade and booming blade spells pose a number of questions, because they each do something unusual: require you to make a melee attack with a weapon as part of the spell’s casting.

    First, each of these spells involves a normal melee weapon attack, not a spell attack, so you use whatever ability modifier you normally use with the weapon. (A spell tells you if it includes a spell attack, and neither of these spells do.) For example, if you use a longsword with green-flame blade, you use your Strength modifier for the weapon’s attack and damage rolls.

    Second, neither green-flame blade nor booming blade works with Extra Attack or any other feature that requires the Attack action. Like other spells, these cantrips require the Cast a Spell action, not the Attack action, and they can’t be used to make an opportunity attack, unless a special feature allows you to do so.

    Third, these weapon attacks work with Sneak Attack if they fulfill the normal requirements for that feature. For example, if you have the Sneak Attack feature and cast green- flame blade with a finesse weapon, you can deal Sneak Attack damage to the target of the weapon attack if you have advantage on the attack roll and hit.

    Also, you actually can use Booming Blade twice in one turn because its a cantrip. The limit for spells cast only applies to leveled spells. The easiest way to Booming Blade twice is the Sorcerer metamagic Quicken Spell.

    • @[email protected]
      5•1 year ago

      The limit for spells cast only applies to leveled spells.

      This is not worded completely correct; you can cast two leveled spells in one turn (using Action Surge). You just cannot cast a leveled spell in the same turn as casting a spell using a bonus action.