Vulnerability Debuff interaction with Black Spidey

Texas_11

I am looking at a synergy with stealth suit spider man and black spider man: What does this vulnerability do? Increase attack rating by what % and decrease block proficiency by what %. .

Thanks in advance.

FreeToPlay_21

Black Spidey as in Miles or the Symbiote one?

RoninMan

Vulnerability increase the amount of crit damage you do.