With the new batch of Round 10 Updates, there are certain restrictions for group attacks and defenses. There is a maximum of 6 combined attackers, while including the leader/orgininal is a total of 7 attackers. On the defender's side, it is the same. There is a maximum of 6 other alliance members defending the orignal targetted empire, giving a total of 7 defenders.

The stats for looting was also upgraded in the Round 10 Updates. If the attacker wins, the minimum stolen loots are 10%, which does not included the calculation of Empire Protection. The maximum loot is set to 70%. All the loots will be divided equally among all the attackers, regardless of how much military units were sent in the attack. For example, if two empire are combined to attack one enemy empire, Attacker A sent 10,000 units while Attacker B sent 100 Unit; if these two attackers win the battle, the loots will be shared equally between themselves. (Choose wisely on who you want to be included in your battle!)