Questions about ability checks and multiclassing with spells.

[BloodSnake'sCha]

So that learned spell also applies with changing one spell to another with leveling up also ignore the other classes in multiclass?

With multiclassing 1wizard and multiple arcane trickster, can I use any of those learned from copying level 1 wizard spells as how a arcane trickster casts(sorcerer style) and using all level 1 slots?



If someone could please answer these questions about spells in general?

You prepared the spell differently and cast them as if you were the class the prepared them.
You can yous any slut to cast them(so if you have multiple AT and one wizard you can upcast burning hands to a level 5 slut even if you only have it as a wizard.

Your slots are different from your known/prepared spells.
The slot are universal and work like the table.


About what you quoted I already answered, the spell are not resisting, there is no such thing.

The JoAT and reliable talent work with counterspell and dispell magic because those spells use an ability check ant those two features boost ability checks.
Most other spells use an attack roll or no roll. If it is not called an ability check it is no boosted.