Looking for some insight into the relationship between magical knowledge and the other Spheres. It's apparent that magic has at one time or another been shared over to different worlds, with arcanists like Mordenkainen, Bigby, and Tenser having many of their spells known on Toril despite being from Oerth. Is there any particular explanation for how the Weave plays into this, if it only exists through Realmspace? Any particular challenges that must be overcome when castings spells in one Sphere to another?

For that matter, what becomes of a Sorcerer that attempts to cast magic in a foreign Sphere? The workaround that I guess the creators of the settings used is that a wizard could relatively easily modify his formulae and casting when traveling between the settings, making up for the presence or absence of the Weave. Sorcerers would either be SOL or somehow intuitively pick up on what to change about their methods. Or more confusing still, they do what they always do and it works exactly however it's supposed to in the setting, which throws the significance of the Weave into question.

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I would like to revive and expand this discussion.

It is held that magic and the Weave go hand-in-hand - that spellcasters access magic trough the Weave. But what about devils/demons and especially Far Realm creatures (who generally tend to be more focused on psionics but...)? It would seem strange to me for these creatures to also use the Weave (and by extension de facto pay homage to Mystra), when they are often in direct opposition of the gods, and faith in general.

And what about spellcasters that aren't actually on Toril anymore - eg. Spelljammers?

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Aurelius: Sunmaster of Amaunator. Contemplative. Aspirant to Transcendance.
"Sol Invictus"

Firstly I don't know if it can be said that demons/devils have anything against gods or faith - many of them are divine servants after all. And Far Realm entities have such incomprehensible, inscrutable motivations it's impossible to say what their relation with the gods really is (except nature deities probably hate them, and Ghaunadaur is probably pretty cool with them, along with Ilsensine, the Great Mother (if she's in this setting)...). You might as well say that evil gods and their followers should avoid the Weave (although some do turn to the Shadow Weave, but it's a shortlist and they're pretty much all allied to Shar).

That said, AFAIK the Weave is only over the material plane. On other planes I'm given to understand that magic is directly accessed from the plane itself. I'm not entirely sure how this works, and I might be completely off with this.

Toril is just a planet within the material plane, so presumably if you Spelljam (not that we need to worry about that on Amia) or otherwise invoke interstellar travel, you're still on the material plane and thus still subject to the Weave.

Regarding DI's original questions - not a bleeding clue.

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@Thanatopsis#6293

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Interestingly enough magic is influenced by the plane it is used on. I am not sure how people are able to draw upon magic but there being no weave I can understand. Why would Mystra be able to influence magic in Greek realms where Hecate is the godess of magic? Or in Sigil where she absolutely isn't welcome?

As an exemple of planes influence on magic; wild magic is enhanced hugely in Limbo and to a lesser extend in Ysgard, Pandemonium and the Abyss while its nullified on Mechanus and diminished on Arcadia, Archeron and Baator. Water spells aren't good on the plane of fire and so on.
Fiery layers of Baator enhance elemental fire spells though using fire spells on the icy layers of Cania and Stygia is daft. So even on the same plane alterations to magic can vary widely.

Specfific (and incredibly rare) keys can work around this but these keys only work on one plane (Eg, a key that works on Baator doesn't do so on Archeron.)

To add to it magic in divine realms on planes is only affected if the resident deity approves of the changes. Hecate from the greek pantheon for one, as mistress of magic, has lifted all of the Gray Wastes magical restrictions from her realm.
Deities appearantly can't affect the planes restrictions outside their realms.

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If I'm remembering my Dragonlance correctly on Kyrnn magic is accessed through one of the three moons above the world, each providing a different alignment of magic, good, neutral and evil. Each is represented by a god which control each type of magic. Something along those lines and nothing involving the Weave.

I think to answer the OP you'd need to dig through all the D&D setting's lore on magic and come to some conclusion relating to any common similarities to figure out how magic can be used from one sphere to the next. Or it may be answered in the Spelljammer source books which I haven't read in many a year.

However, more broadly I guess magic is magic and the Weave is just one way of how mortals can tap into it. Perhaps on another world without the Weave, another conduit can be found instead to tap and the spell caster can just cast as normal.

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