Larian Studios Forums Divinity: Original Sin 2 Divinity - Original Sin 2 - General Are stat bonuses multiplicative or additive?

10% to magic shields means 10% of the damage dealt to the magic shield. Damage to magic shield is always separated and shown in purple numbers. (130% -> 10% vs shield -> 13% of the damage as pure shield damage on top)

And I think, the damage of wands gets boosted as well, because it goes for every kind of elemental damage, but I wish they would show it better.