Phantom Assassin and Visage have both armor corruption talents. As of now, these do not stack, meaning when both attack the same target, they refresh one debuff on it.

However, the debuff's reduction value does not update on refresh. This means Visage can keep refreshing PA's -4 armor on the target, despite his being a -3 reduction.

The reduction should update on refresh (and maybe should stack from different sources).