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The booming blade and green-flame blade cantrips from the Sword Coast Adventurer's Guide both have the particularity of including a single melee weapon attack as part of their casting.

Several martial abilities, like Extra Attack or the Martial Arts’s bonus attack, do not work with these cantrips because they require the Attack action to be used.

However, the Hunter Ranger's Horde Breaker ability (which lets you do an additional attack on another target with the same weapon once per turn) only requires an attack with a weapon, not necessarily the Attack action. Therefore, I’m wondering if a Hunter Ranger with Horde Breaker could get that additional-attack-on-different-target-with-same-weapon when using booming blade or green-flame blade.

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  • \$\begingroup\$ Note, the answer mentioned in the bounty has been updated appropriately. The errata to bb and gfb did not affect the ruling in any way. \$\endgroup\$ Mar 24, 2021 at 19:46
  • \$\begingroup\$ @Rykara I'm a bit confused by this bounty, is there some significant change to the answer that results from this errata? \$\endgroup\$ Mar 24, 2021 at 20:02
  • \$\begingroup\$ @Rykara I don’t understand. What does the range of booming blade have to do with the range of my weapon? \$\endgroup\$ Mar 24, 2021 at 22:52
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    \$\begingroup\$ @Rykara I don’t see how that question is related at all. Like, yeah, it’s a different answer, but that’s not irregular because it’s a totally unrelated question. \$\endgroup\$ Mar 25, 2021 at 0:31
  • \$\begingroup\$ Yeah I’m not following. The other question has nothing to do with Horde Breaker so I don’t see how you’re using it to make a ruling about Horde Breaker. Ask a new question. \$\endgroup\$ Mar 25, 2021 at 0:50

2 Answers 2

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Yes

Horde Breaker states (PHB, p. 93, bold added):

Once on each of your turns when you make a weapon attack, you can make another attack with the same weapon against a different creature that is within 5 feet of the original target and within range of your weapon.

For both Green Flame Blade and Booming Blade, you do make a weapon attack:

You brandish the weapon used in the spell’s casting and make a melee attack with it

Note that you won't get any of the benefits of either spell a second time for the second attack, as explained in V2Blast's answer to this Q&A: Can Green-Flame Blade be cast twice with the Hunter ranger's Horde Breaker ability?

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    \$\begingroup\$ I fully agree, but I think an improvement would be to say why the spell doesn't benefit the 2nd attack to close the loop. \$\endgroup\$
    – NautArch
    Jun 22, 2018 at 14:21
  • \$\begingroup\$ Updated the spell description in the answer to match the Nov. 2020 Errata. The substance of the answer remains unchanged. \$\endgroup\$ Mar 24, 2021 at 19:27
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The wording for the booming bladeand green-flame blade is:

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

Horde breaker requires you to make any melee attack, so the requirement for a melee attack is still met

Related, the spell doesn't work with the second attack is because spells do exactly what they say, no more no less, and this spell refers to this one specific attack, not to all attacks you do this turn

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  • \$\begingroup\$ The answer you quote is not outdated. The quote in it is taken directly from the Errata’d version of booming blade. \$\endgroup\$ Mar 26, 2021 at 11:45
  • \$\begingroup\$ oops i saw the bounty and got confused. Should i delete the answer? \$\endgroup\$ Mar 26, 2021 at 11:47
  • \$\begingroup\$ You dont have to delete the answer, but I recommend reworking it so as not to be about the other answer. Up to you though. \$\endgroup\$ Mar 26, 2021 at 11:48
  • \$\begingroup\$ Do you think this is better? \$\endgroup\$ Mar 26, 2021 at 11:56
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    \$\begingroup\$ Yeah, looks fine. \$\endgroup\$ Mar 26, 2021 at 12:01

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