As someone who’s been desperately trying to find an Undead-based guild myself, I can say that I’ve found 3 guilds so far:
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Evil/Void/Mercenary RP (includes baddies like the Forsaken, the Darkfallen, the San’layn, the voidly creatures, Nightmare Druids, etc.
[PCU] [X-FACTION] North & Void RP -- The Grim Gest ☠ -
Seems like a cool Undead guild, too, judging by their thread:
[H-RP] The Forlorn Order -
Another PCU guild, but, I must say (not in a way to offend them!) that they are specifically a Forsaken-loyalist guild, focused on former-humans (no San’layn fantasy stuff and such)
[PCU] Forsaken Loyalist RP - The Rotgarde 💀