Hello.
1. You need to complete the Curse of Osiris campaign, each adventure on normal, and one adventure on heroic difficulty before Brother Vance gives you the first Prophecy.
2. The Truth quest is a guaranteed drop; however, it only drops from the chest after defeating Arunak, the Ogre boss.
3. Yes, it drops from the first encounter of the Last Wish raid. As for the Seed you can get from the Offering, the portal only opens during a full curse week. That would be next week and every three weeks after that.
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1. I did all that. Nothing. 2. That explains that one. 3. That explains that one. Thanks for the answers.
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Did you look through Brother Vance's inventory (make sure you look at both pages)? He should have 1 or 2 weapon quests to choose from. It could already be in your inventory too, as you can only hold one, and they disappear from Vance's inventory once you have one. Once you get that from him, you have to farm a ton of whatever activity it tells you to. Strikes, Public Events, Crucible matches, etc.