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
Amazon.com: Overlord, Vol. 16 (light novel): The Half-Elf Demigod Part II ( Volume 16): 9781975367800: Maruyama, Kugane, Cunningham, Andrew, so-bin: Books