If a spell has a duration that lasts until the end of the caster’s next turn, such as booming blade, and the caster dies before then, is the spell ended when they die or does it continue until when their turn would have occurred?

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    \$\begingroup\$ Allegations of duplicature are being discussed on meta. Let’s hold off on further opens and closes until it has been discussed. \$\endgroup\$ – Thomas Markov Jan 23 at 20:39

The spell would last for its duration, unless it is concentration.

This applies for any spell that has a duration without a concentration, such as Continual Flame or Aid. There is no reason these spells would stop on the caster's death, so there is no reason for the spell that only lasts for 1 round to end either.
Let's take Mind Sliver for example, since Booming Blade does not last until the end of the caster's next turn, but only until the start:

Duration: 1 round

...The target must succeed on an Intelligence saving throw or take 1d6 psychic damage and subtract 1d4 from the next saving throw it makes before the end of your next turn.

As an example, suppose there are 3 creatures: the Caster, the Target, and the Ally, who have initiatives of 15, 10, and 5, respectively. The caster casts Mind Sliver, and the Target fails. The target's turn comes around and they kill the caster. On the Ally's Turn, the Ally (not knowing the caster is dead) readies an action to cast the spell Frostbite on the Target, triggering on the caster's turn provided the caster does not make use of the effects of mind sliver. When the caster's turn comes around and they take no action (because they are dead), the Ally releases the Frostbite spell, and forces the Target to make a saving throw, with a d4 subtraction due to the mind sliver* that is still active. Mechanically, this would be described as waiting until initiative 15, and if no spell is cast from the Caster on initiative 15, then the Ally will instead cast their spell.

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    \$\begingroup\$ It sounds like you're saying to keep the dead creature in the turn order until its effect durations are finished. If so, I think the answer would benefit from saying it directly. (I'd agree that that probably is the right procedure.) \$\endgroup\$ – Mark Wells Jan 24 at 0:18
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    \$\begingroup\$ I like the example in general and agree with the reasoning of the answer. However, the issue of the readied action adds unnecessary uncertainty. I'm not sure a valid trigger for a readied action is "I cast the spell on the Caster's initiative" or "I cast a spell if the Caster does not even though I don't know that they are dead." A less contentious example would be more to the point. \$\endgroup\$ – Kirt Jan 24 at 3:28
  • \$\begingroup\$ Are there any rules that suggest keeping a dead character in initiative is a rule or just a sensible ruling? \$\endgroup\$ – SeriousBri Jan 24 at 11:25
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    \$\begingroup\$ What about non-spell abilities whose only indicated duration is "until the end of [the creature's] next turn", such as the Empyrean's Bolster ability? \$\endgroup\$ – Ryan C. Thompson Jan 24 at 16:36

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