oh. is this the "vermintide meets diablo" system I was thinking of, when Wolcen added the co-op missions?
If it is, this could be really good. Its not really a fully formed idea, or mode in Wolcen.. Just hot joined missions, with you running down fairly straight hallways, with monsters spawns, ending with a boss, and party loot.
Vermintide/l4d do have the potential to be even more fun, as isometric arpgs, then first person.
have character classes ala Vermintide, with multiple builds. have premade levels, with procedurally generated RNG in the pathing, ala Vermintide/L4d. Spawning hordes, boss monsters, etc. horde checkpoints, etc.
would be awesome.