Grand Missions are large-scale operations for 8 or more players. Users queue up for an instanced and timed mission, where they must defeat as many enemies as possible within the time-limit. The more points users acquire, the better their ultimate rewards will be. These missions are only available during certain windows of time, typically after maintenance.
Currently, there is only one Grand Mission to choose from, with 3 separate level versions of it:
[Placeholder for Castle Grand mission] -- Level 10, Level 15 and Level 20
Rewards: Potions, Golden Orbs
Note: Players do not receive gold or exp for doing grand missions, though they will receive a certain amount of Job points depending on the mission's level.