
Beastman |

what happens to spells if a sorcerer mutliclasses in to a wizard?
Nothing.
If he casts a sorcerer spell, he casts it at his sorcrer class level.
If he casts a wizard spell, he casts it at his wizard class level.
The charcater essentially has two caster levels: one for his sorcrer and one for his wizard class.
The character has two spells per day "tables" (one for his sorcerer based on his sorcrer class level and charisma and one for wizard based on his wizard class level and intelligence.
In short: there is nothing cumulative or stacking and each class is treated as a separate "entity" for each and everything relating to spells.

udalrich |

If he gets a familiar from both classes, then the familiar's abilities are based on his combined sorcerer and wizard level.
But otherwise, there's no interaction between them. It's probably a bad idea unless you're taking one level for a blood line or school power. And I'm not thinking of any cases where that would be worth the lost level in the main class.

stuart haffenden |

Beastman wrote:Doesn't a rank in any spellcasting class increase caster level? i.e. isn't Ftr 2 Sor 4 Wiz 5 a CL 9 character?
The charcater essentially has two caster levels: one for his sorcrer and one for his wizard class.
No.
For Wizards spells he is a 5th level caster.
For Sorcerer spells he is a 4th level caster.
If your DM allows "other" non-PF material look at Practised Spellcaster Feat in Complete Arcane. You would apply this Feat to either Wizard or Sorcerer and it would increase your caster level by a maximum of 4 in that class.

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Could always come up with a "Natural wizard" Feat...that grants full caster level for Wizard/Sorcerer Multiclass, they just wouldn't advance in their respective class levels or gain additional spell slots.
Alternately, you could create a PrC that is similar to the Heirophant but for Wizard/Sorc instead of arcane/divine.
(Though I would be leary of that one.)

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Unless it was changed in PFRPG, the class levels in Sorcerer & Wizard stack for caster level, but they only get the spells for their actual class levels.
Caster levels do not stack from each class, nor do I recall them doing so in 3.5.
A spell's power often depends on its caster level, which for most spellcasting characters is equal to her class level in the class she's using to cast the spell.
You can cast a spell at a lower caster level than normal, but the caster level you choose must be high enough for you to cast the spell in question, and all level-dependent features must be based on the same caster level.
In the event that a class feature or other special ability provides an adjustment to your caster level, that adjustment applies not only to effects based on caster level (such as range, duration, and damage dealt), but also to your caster level check to overcome your target's spell resistance and to the caster level used in dispel checks (both the dispel check and the DC of the check).
The text from the d20srd for 3.5 mimics the above.
Your God of Knowledge,
Nethys

Majuba |

Doesn't a rank in any spellcasting class increase caster level? i.e. isn't Ftr 2 Sor 4 Wiz 5 a CL 9 character?
It does if you use Magic Rating from SRD/Unearthed Arcana. It's a very subtle way of allowing combinations like this to work a lot better without overdoing the power level.