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The booming blade spell (Sword Coast Adventurer's Guide, p. 142) says:

As part of the action used to cast this spell, you must make a melee attack with a weapon against one creature within the spell’s range, otherwise the spell fails. On a hit, the target suffers the attack’s normal effects, and it becomes sheathed in booming energy until the start of your next turn. If the target willingly moves before then, it immediately takes 1d8 thunder damage, and the spell ends.

Does the secondary effect of booming blade (which does extra damage if the target moves before my next turn) stack if the spell is cast a second time as a bonus action through the sorcerer's Quickened Spell metamagic?

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No, if you cast booming blade twice, it will still only deal its extra damage once. The damage from the normal hit does still happen, as it is an instantaneous effect.

See Player's Handbook p. 205, “Combining Magical Effects” (or the corresponding section of the basic rules):

The effects of different spells add together while the durations of those spells overlap. The effects of the same spell cast multiple times don't combine, however. Instead, the most potent effect — such as the highest bonus — from those castings applies while their durations overlap.

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    \$\begingroup\$ (...) even if cast by different spellcasters. I'd add as a corolary. So even if a second caster uses booming blade, the effects wouldn't stack at all. Only the most powerful / longest one. \$\endgroup\$ – Mindwin Jul 18 '17 at 15:39
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    \$\begingroup\$ note that the additional damage you deal on hit at higher levels will still occur twice - i.e. if you are level 5 and cast booming blade twice, you deal weapon damage + 1d8 on each hit, even though the damage dealt upon moving is still just 2d8, not 4d8. \$\endgroup\$ – PixelMaster Jan 31 '18 at 19:02
  • \$\begingroup\$ Another note is that you could use this quickened cantrip to affect two enemies with Booming Blade and each would suffer from the full effects of the spell. \$\endgroup\$ – Joshu's Mu May 18 '18 at 18:18
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Wouldnt the last few words matter here? "while their durations overlap." The duration of each booming blade ends as soon as the bonus damage triggers, so you would take the damage riders in sequence as each one expired.

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  • \$\begingroup\$ No, you'd take both simultaneously because they both have the same trigger. They're identical effects, so only the most potent applies. Also... this is a comment, not an answer. It will likely be deleted. \$\endgroup\$ – T.J.L. Jul 23 '18 at 20:56
  • \$\begingroup\$ Its about parsing the "effect". The "effect" is not the damage. The effect is the entire block of text: "On a hit, the target suffers the attack's normal effects, and it becomes sheathed in booming energy until the start of your next turn. If the target willingly moves be- fore then, it immediately takes 1d8 thunder damage, and the spell ends." So the simultaneous effect rule is that you have ONLY 1 "sheath of booming energy" on you at a time. Once the duration of the first one expires, the second one comes online. For example, a targetted dispel magic would only negate 1. \$\endgroup\$ – John Blaise Lent Oct 1 '18 at 16:06

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