so a boss battle gamemode with different unique bosses you and you're friends can battle with like 1-8 players per fight and the bosses could be like a custom nether boss with different stages and it gives you effects and it has custom attacks. you could also get coins while fighting it depending on how much damage you got on one of the bosses stages you and you're team like if you did 1 damage total on the stage you just killed then you would only get 10 coins probably but if you did 100 damage then you would get 1000 coins. you could maybe use your coins in a shop with custom items and gear and multipliers for your damage or coins or smth. The higher stage you and your team killed the more coins you would get. illustration right there: