Guild Wars 2

Hi folks,
just a quick question which bothers me a bit.
I think I know the answer but just in case:
Do sigils which increase damage % (force, of the night, slayer sigils) stack?
If I have a superior sigil of force on my sword and a sigil of slaying undead on my focus, do I get 15% dmg against undead (in Arah)? OR forcenight (in a night dungeon) do I get +15%?

Many thanks!

ya night/force stacks as does night/undead (or any other dungeon-specific sigil).

Like other damage boosts, I believe they’re multiplicative. Though the same kind won’t stack.

So like your typical Warrior build, while wielding a Greatsword with full adrenaline, potion, night/force sigil, would get

damage X 1.1 X 1.1 X 1.1 X 1.15 X 1.05. I think

Thanks, guys! Much appreciated.