Originally Posted by
Ieronon
Guard's Guard Destroyer, Conq's Breach and BS's Rune of Aggression are physical Ruins, not Wracks (they are removed by Steadfast Faith and not by Resolve). They do not stack with each other : the timer is only reset on the most recent application.
(The physical wracks are applied by Conq's Feint, BS's manifestation of the forest (I think) and by Sin (grim corruption), ranger, and necro)
BTW Guard's guard Destroyer is 20s long while other ruins are 15s long. For better debuffing a conq shouldn't use breach while a Guard Destroyer still has over 15s left.