How does DC on a spell from two classes work?

[PestWulf]

I'm trying to understand how the same spell from two classes will work.

I know when memorizing spells you have tabs for the different classes. Are they kept separate that way when casting? Take for instance Hypnotism. With a bard the DC is charisma based and a Wiz DC would be intelligence based.

Are they kept totally separate? so that if I want to use the DC for Int I would learn it under the wizard tab and if I wanted the DC to be charisma I'd learn it under the bard tab? or are they combined based on which class has more levels kind of like how a TR chooses which class gets the perk?

Thanks for any info.

[FuzzyDuck81]

Not certain, but since they're from different spell lists with different stats to determine DC, its likely they'd count as different instances of the same spell & dc, spell pen etc. would be based 100% on the class whose list you take it from.

[PestWulf]

That's what I was kind of thinking, especially since they put in cost/casting time breaks for bards on certain spells. But assuming has gotten me into trouble in the past

Would be interesting if a splash of bard got you some price/casting breaks in some of the cc spells.

[coolpenguin410]

They're totally separate and independant.

A level 3 Bard/ 2 Wizard would cast Bard spells exactly like a level 3 Bard and Wizard spells as a level 2 Wizard. Your Bard spells would be CHA based and have a caster level of 3 (for duration, damage and spell pen). Your Wizard spells would be INT based and have a caster level of 2 (for duration, damage and spell pen). This applies even if you have the same spell on both lists.

The short answer is don't multi-class casters. They don't stack and are usually very, very, very bad.