the archetype winter witch for the witch class has an ability

[zainale]

the archetype winter witch for the witch class has an ability called

Ice Magic

When a winter witch casts a spell with the cold descriptor, the save DC of the spell increases by +1. A winter witch cannot learn or cast spells with the fire descriptor at all.

is this just for a witch's spells or all spells from all sources including other classes?

[Ectar]

All spells of any class.
This ALSO means that a multiclass winter witch can't cast fire spells of any class.

[MrCharisma]

I actually completely disagree with Ectar. Any time a class says "this class does X" they're almost always referring to their own class abilities.

Anyone else want to weigh in?

[zainale]

let's hope so.

[Drahliana Moonrunner]

It's the same logic with wizards who take a single level of certain sorcerer bloodlines. The ability says "casts a spell" It does not say "cast a spell from the witch slots only."

[Hubaris]

Any spell with the Cold Descriptor, regardless of the list of casting type.

Much like a Sorcerer Arcana.

[Samasboy1]

FAQ

"General rule: If a class ability modifies your spellcasting, it applies to your spells from all classes, not just spells from the class that grants the ability. (The exception is if the class ability specifically says it only applies to spells from that class.)"

So all classes, not just witch.

[zainale]

then what about sun metal or [http://www.d20pfsrd.com/magic/all-spells/b/burning-disarm]Burning Disarm[/url] trying to go for the heat of summer like spells

[Tarik Blackhands]

If you want to use those then don't go Winter Witch PRC. If it's [Fire] it's forbidden, no matter the spell list I'm afraid to say.