I have a clan and was looking to be a guide and run a guided game of leviathan but I can't find the guided games anywhere and haven't for a while. I saw it before when I was in my friends clan but after I left that clan and joined another it just doesn't show up. As for Nightfall it is there and I can select that but can't do anything yet because i'm not 540 yet.. even though I have had no problems doing the nightfall plenty times this week already.