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Insidious Cold
The effect Insidious Cold has a separate DC to your spellcasting DC. This isn't uncommon in 5e, but not outright stated anywhere in bg3.
Using a divination wizard I identified that the DC seems to be 12. I'm not sure if items and effects that increase your DC affect this as well.
I investigated this as it was strange how infrequently I'd ever actually see Insidious Cold affect an enemy.
Tl;dr: Insidious Cold is a DC12.