league replayability ideas

increase replayability and player retention for a league with incentives to play each class into the end game.

Offer exclusive cosmetics for various milestones for beating it with each class.

examples:
beat the campaign with warrior = get cool helmet 1
beat the campaign with ranger = get back piece 1
beat the campaign with sorceress = get cool boots 1
etc

beat xesht with warrior = get cool helmet 2
beat xesht with ranger = get cool back piece 2
beat xesht with sorceress = get cool boots 2
etc

I would love this, except please consider small hideout decorations for achieving milestones. I already have more armor sets than I will ever wear.