1 Fire Elemental: To be truly worthy of the title of Master Elementalist, you must...
2 Kyros: Undertake a grand quest? Research arcane and long lost magics?
3 Kyros: Defeat hostile ravaging monsters? Walk the planes of the multiverse?
4 Fire Elemental: ... Master all the Elements.
4 Kyros: Oh.

Well that should be relatively easy, then.

If you want a read that spans everything from philosophy, to advanced theoretical physics, to comics and fantasy games, check Wikipedia's article on multiverse.

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2025-01-18 Rerun commentary: Everything is multiverses these days. It might be nice to have a story that's just set in a single universe for a change.

Meanwhile, in an alternate universe, a parallel version of me is typing:

Everything is single universes these days. It might be nice to have a story that's just set in a multiverse for a change.