What is overlord 4 season?

As an AI language model, I do not have access to confidential or future information about upcoming movie or TV series. As of now, there is no official announcement about the fourth season of 'Overlord' anime series. The third season ended in 2018, and fans have been eagerly waiting for the next season. However, the production team has not revealed any details about the new season. It is expected that the announcement and release dates may be delayed due to the ongoing pandemic situation. Fans of 'Overlord' will have to wait for any official news about a potential new season.