Fate of all Fools was a gun owned by Osiris himself, hence why the bounty is retrievable from the Trials of Osiris.. One day Osiris ventured into the Vault of Glass to save Kabr, he found him but Kabr wanted to stay and help other guardians beat Atheon.. As Osiris mastered blink (Titans can't therefore Kabr was stuck) the warlock escaped the Vault, however his armour was damaged and it parts just gone all together (He also went back in time).. As Osiris was a wreck in the wilderness he was found by the Stranger, she kept him safe and kept him safe from the darkness.. To repay her, Osiris gave her his broken gun, he also infused it with his own light (Hence the flashing light on Strangers Rifle) so she could fight the darkness.. The Stranger modified the gun (From a broken Scout to a working Pulse).. This explains why she gives you her gun, you helped save her and everyone from the darkness, just like she saved Osiris..
Im 99% this is true (Grimoires knowledge)
Hope you like the theory :)
English
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Boy, do I have news for you
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Its not exactly retrievable atm
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There was an interview from bungie said it is not obtainable from the game in anyway it was givin to a guy with a brain problem and only him will get it
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Hold on, what Grimoire Cards is this from? I would like to read it for myself
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It's mainly a copy from another's post but my own interpretation.. Makes 100% sense tho when you think about it