See log: BATTLE LOG: Scenario=Stafford Main Hall,Room=STAF (Mondomau),RoomID=115860,Msg=The active player is now Gary BATTLE LOG: Player=Gary,Scenario=Stafford Main Hall,Room=STAF (Mondomau),RoomID=115860,Event=PlayAction,Action=Powerful Bludgeon,Instigator=Cardob,Targets=Grim BATTLE LOG: Player=Gary,Scenario=Stafford Main Hall,Room=STAF (Mondomau),RoomID=115860,Event=TriggerSucceed,Trigger=Horned Plates,TriggeringActor=Grim,AffectedActors=,TriggerType=PreDamage,TriggerLocation=Hand BATTLE LOG: Scenario=Stafford Main Hall,Room=STAF (Mondomau),RoomID=115860,Group=Grim,Event=Discard,Card=Horned Plates Is this right? Had Horned Plates + Impenetrable Nimbus, took several shredding strikes, stopped by the nimbus, retained the Horned Plates. Then he hits me with a Powerful Bludgeon, Horned Plates discarded? Cheers!
Unless you snipped it out, that's a new round starting there (and no nimbus was involved in this specific case) and your horned plates just activated - and since it's a non-keep armour, is discarded.