Here’s the directory: https://us.forums.blizzard.com/en/wow/t/wra-information-directories/651240/28
And here’s a DK guild you might wanna look into:
https://us.forums.blizzard.com/en/wow/t/a-the-shadow-vault-knights-of-the-ebon-blade-rp-casual-raiding/707958/5