From Destinypedia, the Destiny wiki
Perfect Paradox is a Legendary Shotgun in Destiny 2 introduced in the Curse of Osiris expansion. It is obtained after completing the Legends Lost world quest on Mercury, as part of a series of weapons created using the The Infinite Forge. It is also obtainable after completing Recovering the Past in Season of Dawn.
The Perfect Paradox is the signature weapon of the legendary Saint-14, a Titan thought long lost after venturing through the Infinite Forest in search of the notorious Warlock, Osiris. True to the weapon's name, the Perfect Paradox is subject to myth in its own right; The weapon was supposedly in the possession of the Guardian before being given to Saint-14 at an unspecified point in the past, having been forged in the present day. To forge the weapon, the Guardian traveled to the Simulant Future to visit the Titan's grave and recover his personal effects. After the weapon was reforged using the Infinite Forge, it was then bestowed back to him as it had originally. However, unable to navigate or escape the timelines of the Infinite Forest like Osiris could, Saint-14 remained stuck in his timeline and proceeds through the events leading to his death while holding the Perfect Paradox. The timeline eventually progresses to the Simulant Future where the weapon is recovered by the Guardian, thus repeating the cycle of its lifespan.
This cycle was broken through the events of Season of Dawn, where Osiris and the Guardian finally manage to free Saint-14 from the loop and allow him to exit the Infinite Forest.
I never found Osiris, but I've killed enough Vex to end a war. And they, in turn, struck a fatal blow: they completed a Mind with the sole function to drain the Light from me. It worked very well.
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