After being recruited by the Time Thief founder, the guy I refer to as Jailbreaker, Poly grew deep fascination with the multiverse and it's different species, different abilities and different possibilities. Many timelines were thrown off course from Poly gathering resources and studying species. Eventually he turned Duality into the person he is. Eventually he created a Frankenstein type monster which he controls using the small amount of mind chronos. Because of this limited mind chronos he developed technology which allows him to amplify mind chronos including an antenna for the Frankenstein monster. This allowed him to gang a deep understanding on mind chronos which he taught to spirit, eventually allowing him to possess people. Eventually the Time Thieves develop a plan to infiltrate the Time Patrol prison by having their guys get caught then Spirit shows up and breaks them out, while the rest of the Time Thieves attack from another spot. For this, Poly gets captured during a Time Patroller's mission and sat there until the Jailbreaker Arc. After being broken out, they rushed to see the Time Patrols scientist and killed him. Eventually Poly themselves was killed during the war.

If this gets 20 or more likes I'll make a thing for Frankenstein monster.