When someone attacks you, you can perform a revenge attack on them from the Defense Logs. Unlike retrieve attacks, revenge attacks are real, meaning that you are attacking that player's actual dungeon. Therefore, the totem may be broken, may not contain gems, and the player themselves may be online or under the shield at the moment. With the Revenge function, you actually steal gold and gems from the player who attacked you. Once you have performed the revenge attack on someone, they will not be able to get revenge in return.