Board Thread:Fun and Games/@comment-28362353-20171009152445/@comment-28362353-20171016151510

I think it was sort of implied they he fought with Belmod (the clown god) and won, because Belmod himself said that Jiren won’t lose no matter who he’s up against, and Whis then said that the rumor of a mortal being stronger than a God of Destruction was true. So I guess that’s where he got his strength, fighting with a God of Destruction.

(InB4 DBS just makes a stupid explanation and just says that Jiren just meditates all the time and that’s why he’s so strong)