If I multiclass a Magus and a Sorcerer in Pathfinder, how do my casting mechanics end up? Do I get a certain amount of slots that I must prepare in advance in addition to a few I can improvise with, or do they all become either prepared or improvised? Do my spell lists stay separate for the different slots, or can they cross over between caster lists?
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You retain the casting mechanics of both classes separately.
If you were a multiclassed 4th-level character, for example, a Magus 2/Sorcerer 2, you would have all the class abilities of the level you reached in each class, for instance a 2nd-level Magus and a 2nd-level Sorcerer. Their spell lists do not mix; you will have to prepare your Magus spells as if a 2nd-level Magus, and your known Sorcerer spells, numbering as many as a 2nd-level Sorcerer would know, can only be cast from the slots that a 2nd-level Sorcerer would have, and would suffer arcane spell failure chance appropriate for the armor you wear.