Yeah, I was just going to say that. They could action surge and do it twice, but not haste.I found the flaw in my friend's proposed combo - he wanted to essentially booming blade 5 times in a turn, but he can't - the extra action granted by haste does not allow spellcasting.
Yeah, I was just going to say that. They could action surge and do it twice, but not haste.
I think as a sorcerer/fighter with Haste the maximum booming blade abuse you could do would be:
(1) Quickened BB using Bonus Action (2 SP)
(2) Twinned BB using main action (1 SP)
(3) Twinned BB using action surge action (1 SP)
(4) Regular attack (w/o BB) using Haste action
So you are getting 5x booming blade (split between two or more targets) even without Haste if you spend 4 SP. Then Haste can give you one more regular weapon attack.
Twin spell's spell must target a creature other than self, it can't target a weapon. Whether or not the booming blade can be quickened is also debatable, you still need to make an attack as part of the action.
I could see the ruling on the latter may vary from DM to DM, but the former is pretty clear to me.
As I mentioned earlier, Booming Blade does say that you make an attack with the weapon used as the material component as part of the action used to cast it. One could argue that Twinning it doesn’t actually constitute another use of the Cast a Spell action, and therefore doesn’t provide you another opportunity to make an attack as part of that action, it only lets you designate a second target to be affected by the “if you hit it with the attack...” portion of the spell. I think such a ruling would be founded on an overly-technical reading of a spell that is written in natural language, but it’s the kind of ruling I would expect Crawford to give on Twitter.Well, the text of the spell does repeatedly refer to "the target", so it does seem to target one creature (and to be incapable of targeting more than one creature, unlike green flame blade). It has a range of 5', not a range of self, and no AoE component, so... RAW, I don't see why you couldn't twin it? I also don't see why you couldn't quicken it and cast it again with your action, same as any other cantrip. What does the fact that it involves a weapon attack have to do with anything?