Commander missions
Imagine how nice it would be to get 50 people to do huge boss fights, gathering stuff or killing hordes of monsters. And the rewards could be experience, money and karma; more difficult ones could reward the player with items (one rare – maybe an exotic – per day for the account, just like the world bosses, high tier materials, mystic coins)
You basically described how world bosses work (or should work, if not for the huge zerks) nowadays. What would be difference of these “Commander Events” from regular World Events?