Should there be mob arena?

[Thewitch]

In Arcane Legends we have 3 different playing modes: Normal PvE, PvP and Arena.

For those who dont know, Arena is place where you and your friends fight against boss from PvE map. For example, you can fight against Mother, Grimnr or Captain Rutger there. The bosses are much harder there than in normal mode, but you get achievements when kill bosses.

Anyway, I have thinked about 4th game mode. It's like "Mob arena" where you and your friends fight against mobs and time. First the mobs can be easy (like goblins) and there can come several of them. When you survive longer, there will be harder mobs and more of them will come.
Fighting against time should be fun. More and more mobs will come, so your team needs warriors, rogues and mages to defeat them all. Without warriors you'll die too fast without rogues and mages there will be too much of mobs....
Achievements can be like "Survive 5min in mob arena" etc. and there can be leaderboard times for longest surviving time.

Thank you for reading my idea and please give comments, ideas etc