Super-Short Adventure Ideas

Take 1st level characters.
They don’t have to know each other, or even be in the same kingdom.
Without warning, they are all gated to the Astral Plane, where a lantern archon cleric has summoned them (using the spell Hero Summoning I) to protect it and the rest of its lantern archon adventuring party from astral goblins (or whatever).
They only stay 3 rounds, because the lantern archon cleric is only 3rd level.
If a PC dies, they return to their home plane, uninjured.
The same PCs get summoned, 2-3 times a day, by the same lantern archon cleric. The PCs begin to realize the lantern archon summoning them is trying to save their world, and it’s not doing so well. Of course, the PCs have lots of free time to research its problems, and buy gear to help them deal with the lantern archon’s enemies when they get summoned…
Fun ensues.

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