There should be a badge for fighting the Hall of Heroes fight a certain amount of times. I would suggest 10/100/250 fights. And that should be common on all new updates. It would make farming more enjoyable knowing you were working towards something that wasn't RNG.
Also add a badge in every world for finishing all the "kill this mob 1000 times" badges. If I did all those mobs I wouldn't want to only display one of the badges. I would want to have a super rare one that means I did them all.
