Concetration check for multi class casters

[Ironballs]

A normal wizard level 5 with 16 intelligence have a concentration bonus of 5+3 = 8

what happens when the same wizard has 2 cleric levels - and his wisdom is 14?

do we calculate the classes separatly or do they stack?

I mean, for a 7th level caster, to cast a cleric spell as level 2, a concentration bonus of +4 seems kinda low.

shouldn't the experience as a mid level character who specialize in magic be stacked - levels wise.
the bonus from high attribute for the check would still be intelligence for wizard spells, and wisdom for cleric spell.

so for wizard the bonus would be 7+3 = 10
and for cleric: 7+2 = 9

WDYT?

[Nawtyit]

The check is d20+CL+modifier. They are calculated seperately.
Wizard 5 / Cleric 2:
Wizard 5+3=8
Cleric 2+2=4
You can always take combat casting.

[Nefreet]

It depends on what spell you are casting. If it's a Wizard spell, you calculate your Wizard's concentration check. If it's a Cleric spell, you calculate your Cleric's concentration check. If it's a Gnome spell like ability, you calculate your Gnome's concentration check.

[Ironballs]

is it by RAW?
because under the Concentration Check description, I didn't see any reference for multi class...

[Nefreet]

Wouldn't post it here if it wasn't.

[Nefreet]

Here are the relevant texts:

Concentration wrote:

To cast a spell, you must concentrate. If something interrupts your concentration while you're casting, you must make a concentration check or lose the spell. When you make a concentration check, you roll d20 and add your caster level and the ability score modifier used to determine bonus spells of the same type. Clerics, druids, and rangers add their Wisdom modifier. Bards, paladins, and sorcerers add their Charisma modifier. Finally, wizards add their Intelligence modifier. The more distracting the interruption and the higher the level of the spell you are trying to cast, the higher the DC (see Table: Concentration Check DCs). If you fail the check, you lose the spell just as if you had cast it to no effect.

Caster Level wrote:

Caster Level: Generally equal to the number of class levels in a spellcasting class. Some prestige classes add caster levels to an existing class.

Character Level wrote:

Character Level: The sum of a character's class levels.

Class Level wrote:

Class Level: The level of a character in a particular class.

[Nefreet]

Same thing if you want to obtain an Improved Familiar, or craft a magic item. A Cleric-6/Wizard-6 would be unable to obtain an Imp Familiar (CL 7), despite being a 12th level character. A 15th level Wizard can craft a +5 item. A Wizard-5/Sorcerer-5/Cleric-5 can only craft a +1 item. Multiclassing has its drawbacks.

[AnnoyingOrange]

Yes that is RAW, it is a caster level check modified by your casting ability score.

Not RAW :

Depending if u r GM or not u might be interested in having class levels that increase caster level from multiple classes stack to determine caster level, it makes mystic theurges a bit more viable and removes trait taxes to increase their caster level.

I also allow non-caster levels to count as 1/2 caster levels, rounded down, so multi-class characters might enjoy having a few magic tricks with a decent chance to penetrate SR, resist dispels, or otherwise being fairly effective.

Neither of these houserules increase access to spells.