add a new Marathon mode where you sit in an arena and a random / progressively harder boss steps out of challenger doors and you kill the boss then the next boss is a +1 boss from a different dungeon.
Until every boss is +15 and chest drops after each boss. (Throw in some OG bosses as ‘rare drops’ to fight randomly )
Have raid bosses start popping in ?
Might be fun … might be too hard ,
Who knows.
Sometimes it just will que you against another arena party and you have to pvp to gain your chest … that would be fun. (Just make this a designated pvp mode too … have us load into a random boss room and have to fight it out ala WoW Arenas )
Or … have the other players reskined to look like mobs but we have seeded the model with our character and fight them ala mirror knight or … Monk? From soulsborne series. And dont tell us we are actually fighting other players … both sides just sees mobs. That would make their AI seem much better but we are just killing each other