Crusader Kings 2 is a totally different game to WoW, however one of the best mods for it is in fact a Warcraft mod, it’s still a WIP but it’s so deep, and there is so much you can do in it, and it’s clear amazing amounts of love went into recreating Azeroth in that game, and letting you say screw it and just go wild. A couple of my fun games, personally playing as Sylvanas, just after being freed from the scourge, and conquering all of Lordaeron, taking Dalaran, imprisoning Vereesa and raising her as an Undead member of my court, before joining the Shadow Council and siding with the burning Legion. And my current game, where I’m playing as Grand Ma’da Ateena herself, conquering Zandalar in the name of G’Huun.
It’s such a fun mod, and it lets you go crazy with some “what if” scenarios. It’s not perfect, but it’s still brilliant fun to anyone who likes both WoW and CK.