Trying to launch into a Lake of Shadows Grandmaster, was able to do it yesterday, but now its not in the GM list, but there is listed just 'Grandmaster'. Tried to launch into that one, but its saying my character does not have access (my clanmates do apparently, we are all the same light level).
Did they disable Lake of Shadows?
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That is because you completed it. That GM node is to enable players to quickly run each GM nightfall to gild the Conqueror title. Once you've completed a gilding triumph for the title it gets removed from the node. If you want to run more lake of shadows you will either need to wait for it be the GM of the week or find someone who is working on gilding Conqueror but has not done that GM yet. Regarding this week's GM, if you do not have the Forsaken pack you will not be able to launch the GM. I am unsure if you being the fireteam will prevent the leader from entering, however.