Smite spells as an interrupt

[PKP84]

Would it be possible to make an interrupt version of the Smite Spells?
That would enable some interesting comboes like attacking with Booming blade or True Strike cantrips and, on a hit, you could use the appropriate Smite

[Yoonmoonsik]

Divine Smite and Eldritch Smite already work this way — they're granted through a passive that makes them Always Prepared, so there's no "is this spell currently known/prepared" state to track, and adding them as an interrupt is straightforward.

The other Smite spells (Wrathful, Searing, Staggering, Blinding, Thunderous, Branding, Ballistic, etc.) are regular prepared spells, so whether any given character actually has one in their spellbook, and whether it's currently prepared, varies per-character and can change between rests. Dynamically adding/removing an interrupt hook to match that "in spellbook / prepared / not" state for each of them gets complicated fast.

An alternative would be converting those Smite spells to work only as an interrupt — similar to how Shield or Counterspell function — rather than as an active spell you cast directly. That's feasible. The one thing that approach can't do is a critical/non-critical branch (e.g. reacting differently depending on whether the triggering hit was a crit), since each prepared spell maps to exactly one interrupt — there's no way to hang two separate interrupts (crit vs. non-crit) off the same single prepared spell.

[Yoonmoonsik]

Opened a poll to gauge interest on this: #938

Closing this one out so the discussion continues over there.