Is Nou's gift bugged in ML2?

I looked at Nou's gift armor an d it seems op af, "Relics are found with 10quality more for each room completed without taking damage"

so I assumed it was additive but I go past 3-4 rooms with no dmg taken and the bonus is just 10 which makes it pretty useless, I would not even mind if it stopped working after first instance of damage but it applies once and stops working?