In a City, you can see what rumors are flying around the world by clicking the Rumor button in the Local menu of the navbar. This will tell you about any tournaments in any cities, if a horde is anywhere, if a bubble of evil hit a City and destroyed anything, if a Clan has declared a Clan Battle anywhere, or another Clan has taken control of a city. During the Last Battle, it will also tell you how many estates and businesses were destroyed if a horde was allowed to hit a city.
Items of Legend Tab
In addition to that, this will also be where the Horn holder will be able to Sound the Horn in case of a Horde. The holder will have to go to the city the horde is targeting to do this. And where any player holding a seal will also be able to deposit it into a city from here, if they've held it for at least 24 hours. This can be done from any city.
Once the first Seal breaks, a clock will appear as a countdown to the Last Battle.