If you’re after a lovely OOC environment and want to do a rather diverse range of Undead/Forsaken RP, I would recommend the Forlorn Order: [H-RP] The Forlorn Order
There’s also the Requiem of Sorrow who are (I believe) more military focused, plus the magnificent Hand of Agony, as well as the sinister and deeply evil Rotgarde and Grim Gest if you ever feel like becoming a villain.
(But the right choice is the Forlorn Order.) Have fun wherever you end up!