I have tried to find the quest in my titan and I couldn't find it so I went to the tower went to the abandoned quest line I took out all of the quests and still the quest did not show up any way I can get it
FYI I'm level 15 just about 16 with 326 light
English
#Help
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Your Titan is carrying the Weapon Master quest, which is part of the Mountaintop quest line: https://www.bungie.net/en/Help/Article/44963