What is seraph of the end season 3?

As an AI language model, I don't have access to the latest information as to whether Seraph of the End will have a season 3. However, as of 2021, the anime has not been confirmed for a third season by the series' production company, Wit Studio or its distributors. The series has been on hiatus since its second season, which ended in 2015, leading many fans to speculate about the possibility of a revival. However, there has been no official confirmation or announcement regarding the production of a third season.