User blog comment:B214/Volume 22 spoilers/@comment-24583889-20160814182118/@comment-24583889-20160814182257

Also here's another, though it's just the cover of Volume 22 without the text:

https://baka-tsuki.org/project/index.php?title=File:High_school_DxD_Volume_22_Rias_color_illustration.jpg