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According to this - Is it possible to Twin Spell Dragon Breath or Booming Blade? We can Twin the booming blade spell

Now if I pick

  • 2 lvls in Fighter to get action surge
  • 3 lvls in Sorcerer to get Metamagic and then 1 more to have enough for my plan
  • Get the twinned spell and quickened spell metamagic options

We have 1 action surge, 4 sorcery points and a Booming blade cantrip I should be able to now use my standard action to cast booming blade then Twin it for 1 sorcery point, quicken another one for 2 points, then use action surge and twin the cantrip again.

This results in 5 weapon attacks in a row (Yes we did just deplete our resources from both classes, but it's possible)

The final result is 5 standard weapon attacks which will each have another 1d8 Thunder damage added onto them from the cantrip and possibly per each adding 1d8 if they move willingly (Although this effect might not stack, if anyone finds out if it does, please put the source in your answer)

Now, yes you can't exactly target a single creature with all those attacks, but it still seems a little broken.

That's why I want to ask if there isn't something I've missed or is this really possible?

The potential damage provided all attacks hit and the caster is using a great weapon (like a Maul or a great axe) would be 3d12+3d8 (+3d8 if the target moves afterwards) and 2d12+2d8 on an adjacent target, if I understand this right.

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  • 1
    \$\begingroup\$ In regards to booming blade stacking there is already an answer: rpg.stackexchange.com/questions/103746/… \$\endgroup\$ – Medix2 Jun 23 at 13:32
  • \$\begingroup\$ Do you have a specific reason to think this might not work? \$\endgroup\$ – Mark Wells Jun 23 at 13:37
  • \$\begingroup\$ 5 attacks when classes are expected to have just a single attack at this level seems broken. I don't think that's how it was intended \$\endgroup\$ – Nuloen The Seeker Jun 23 at 13:57
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    \$\begingroup\$ Many classes get extra attack at 5. \$\endgroup\$ – NautArch Jun 23 at 14:34
  • \$\begingroup\$ "Did I just find a new build?" The answer is generally no, someone else thought of it already. \$\endgroup\$ – Almadel Jun 28 at 9:31
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This works, but it is far from powerful

You mentioned yourself that in just one round, you depleted all your Sorcery Points for the day, and you need a short rest to regain your Action Surge.

Triggering Booming Blade when you want1 is close to impossible, especially after the tweet from Jeremy Crawford, excluding Dissonant Whispers and the like.

Comparison

A 5th level Fighter can make 2 attacks with said Maul round after round, doing 2d6+4 damage per hit. This is 11 damage on average per hit, 22 per round. In the first round, he also uses hes Action Surge for 44 damage.

You do 5 attacks in one round, 3x 2d6+3+1d8 2 for 43.5 on average into the first target, and 2x 2d6+3+1d8 halved3 for 14.5 to the secondary. On subsequent rounds, you do 14.5 damage.

So in the first round you only outperform the Fighter of equal level if there is a secodary target in range, and fall way behind on subsequent rounds. Your total damage for the first three rounds is 87, his is 88.
This does not even take into account you have smaller hit chance, as you did not receive an ASI like the 5th level Fighter. Also, he can repeat this after a short rest, while you need a long rest.

This is a lot of effort for less than mediocre results.

Not a completely bad idea

With Green-Flame Blade, the calculation looks like this:
Both targets take as much damage from the primary attacks as with BB, but there is secondary damage. 2x 1d8+3 to the primary target, 3x 1d8+3 halved to the secondary. That is 26.5 additional damage, so the Fighter takes 3 more rounds to catch up.

The famously effective Sorcadins use a variation of your proposal.


1) While I have never seen a Booming Blade triggered, this is mostly because no one I know takes it. You are at the mercy of the DM, if he likes you, BB is great.
2) one ASI behind, I do not expect a Sorcerer to increase Str with the ASI
3) as accepted on the now non-existing WotC forums, attacks to secondary targets are counted as 50%, as two ogres at half hit points do twice as much damage as one dead and one alive. Spreading damage is mostly (95% of the time) is a bad idea. Not always having a second enemy is just one more reason

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  • \$\begingroup\$ Comments are not for extended discussion; this conversation has been moved to chat. \$\endgroup\$ – V2Blast Jun 23 at 21:58
  • \$\begingroup\$ What secondary target? \$\endgroup\$ – Davo Jun 24 at 2:41
  • \$\begingroup\$ A 5th level Fighter who does two-weapon fighting could get 5 attacks (2 from Extra Attack, 2 from Action Surge with Extra Attack, one from bonus action with second weapon) instead of just four attacks. While this would probably be for less damage than your example, it would show that 5 attacks at this level is far from impossible. \$\endgroup\$ – BBeast Jun 28 at 10:26

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