Selection stage
R5 or R4 choose the difficulty and duration of the challenge.
The Alliance must have at least 20 members to start.
If no timetable is set before 10pm (server time) on the last day, the event will expire.
Preparation stage
You can donate "Construction Parts" to increase the damage inflicted during the alliance exercise.
Each donation gives you 500 contribution points to use in the shop.
Even if the damage bonus is at its maximum, you can still donate "Construction Parts" and obtain contribution points.
If you have a lot of active players in your alliance, always donate your construction parts even if the maximum has been reached, as you won't be able to use them for anything else.
If, on the other hand, you don't have many players, save them for future alliance exercises.