Seas of Infinity
At one point in history, long before it was a remote rock on some distant plane, there were locals from the city. They referred to it as Whenua, “The World” in their long forgotten tongue. After its arrival in the distant planes, the city began having arrivals of its own. New citizens, creatures, aberrations, items and elements have all arrived without warning or reason.
The city guard has organized themselves as the first responders to any new arrivals in the city, using the watchtowers and magical alarms to direct troops to the intruder(s). In instances where the city guard is not enough, many heroes reputations have been made defeating the monsters from beyond.