what is this series: Hunter Legends

What is this series? Hunter Legends It seems to be some of the Dark Hunter Universe, but I don't know why the Lords of Avalon books are included.

Looks like https://www.sherrilynkenyon.com/book-series/entire-dark-hunter/ which indeed includes the Kenyon's Lords of Avalon book Knight of Darkness as part of the series (https://www.sherrilynkenyon.com/book/knight-of-darkness/)