What is overlord volume 18 release date?

As an AI language model, I do not have up-to-date information on the release date of Overlord Volume 18. However, it is worth noting that the author of the light novel series, Kugane Maruyama, has mentioned in a blog post in late 2020 that he is working on the next volume, but did not provide a specific release date. Fans of the series will need to stay tuned for official announcements regarding the release date of Overlord Volume 18.