Guild Wars 2

Was wondering if I used the 10% dmg reduction signet on guardian with rune of the scrapper, would that give me -17% incoming dmg, or does it not stack like that?

% percent modifiers stack multiplicatively. So you’d end up with -16.3% or about half of the effectiveness of the Protection Boon. Still not bad, especially on a profession profession that has no shortness of Protection application.

If it was adative, Tempest Ele would be the most broken tank ever I’m pretty sure.