Boss Trophies as 2 stars
I think it would be a really cool idea to grant the summoner a 1 or 2 star version of the boss upon 100% the story chapter, such as Kang, Thanos, Maestro, and Collector. We all want to play around with these characters and as 1* or 2* we couldn't really beat anything with them. This would not impact the game at all but would create a bit of fun for a lot of players.