A wave-clearing event on alliance territory: 5 minutes to prepare, then 15 waves of Blight of increasing difficulty, all on a shared timer. The alliance picks the difficulty before starting the challenge.
What success depends on
Not raw squad strength, but positioning before the fight — assign participants to spawn points in advance and agree on who meets which wave where. This requires coordinated work from the whole alliance, not just a few strong players.
Preparation
Discuss timing, targets, and resource spending before it starts — participants need to know the plan ahead of time, or troop deployments get wasted on the wrong waves.