I have just finished Volume 13, all I can say is if you really love Overlord then I suggest you read the light novels. The paladins of the Holy Kingdom Arc is
Overlord Volume 11 | Overlord Wiki | Fandom
Overlord Volume 11 | Overlord Wiki | Fandom
Overlord, Vol. 12 (light novel): The Paladin of the Sacred Kingdom Part I (Hardcover) | Trident Booksellers & Cafe