[quote]Conqueror's Discipline - complete a subclass each time on grandmaster nightfall I have done 2 grandmaster mission with a void subclass and I didn’t get a tick box however when I did it with arc I was able to complete the box I was wondering does it tie to specific mission or do I did something wrong - you can’t not change your loadout in game when you started nightfall grandmaster before anyone suggest[/quote] Do it when its not a battle ground GM. The triumph was released before battle grounds were GMs so the triumph doesn't recognize them as being strikes. I doubt bungie will or can fix it. Just wait or join someone that can select a GM that is a strike not a battleground.