New game mode suggestion

Got the inspiration when a guy in my party was bored, following me around in a DoL quest while we're waiting for another person to expand the party...

My idea will be a game mode which needs all possible classes in the game:

- The game will happen in an instance, like entering dungeon
- Waves of enemies will be coming, while players will need to harvest/gather game mode specific materials, and pass it to crafters to create an item needed to finish the game
- The item could be a weapon which can only kill the boss with, a lock to shut down the waves of monsters so the boss can be taken care of etc.

Since it would be hard to form the right team if the materials and item being crafted are class specific.. To make it more accessible, materials and item being used in the gamed mode may have to be generated dynamically based on the party members.