Future Trunks returns to find the Ace who had previously aided him in Age 783 in fighting off Dark Future Android 17 & Dark Future Android 18. As he goes to greet the Ace he senses Villainous ModeFuture Cell, who Trunks is horrified to discover has managed to absorb Future 17 & Future 18 allowing him to reach his Perfect form in Trunks' timeline (a result of Towa's two stage plan to erase Future Trunks from existence). Joining forces with the mysterious warrior Ace, the two time travelers manage to overpower and kill Dark Future Perfect Cell restoring peace to Future Trunks' future timeline.
Having helped him twice, Future Trunks tries to get the Warrior to tell him who they are, but due to Future Trunks' role in the wish that summon the Future Warrior to Toki Toki City in Age 850 the Warrior responds with the cryptic answer "You'll know someday." before the Warrior returns to the Time Nest in Age 850.
In Xenoverse 2, Towa sends the repaired Future Android 16 after his defeat by the Future Warrior (Xenoverse 2) in Age 780, to kill Future Trunks just after he returns from the past (like she originally did with Dark Future Perfect Cell in Xenoverse). The Future Warrior is sent by Chronoa and Elder Kai to defend Trunks and destroy Future Android 16. After managing to damage Future 16, Dark Future Perfect Cell joins the fight as well. Eventually the pair manage to destroy the Dark Androids restoring the timeline. As Future Trunks is about to thank the warrior, he finds they have mysterious disappeared, having returned back to Age 852.