[quote]I'm a returning Guardian, and I still have the "quest" version of Legend of Acrius (the one without any perks, only the Intrinsic Trait), and was thinking of doing its quest to further unlock it (so that I can eventually store it in my Vault). Unfortunately, I was not able to find the associated quest to upgrade it (as it was probably Content-Vaulted ages ago). How can I proceed to unlock it fully?[/quote] The quest to fully unlock the weapon was removed from the game when Leviathan was vaulted and Legend of Acrius must now be purchased from the Monument to Lost Lights. You're free to dismantle the quest version.