Sent/Destroyed:

Colden & Locksen, the First Poltergeists

Princess Barulea, the First Haunt

The Wight Lord Dazgus, sent by Runner One

The Lich King of Kael'Ras

The Lich Queen of the Darkest Deeps

Druzidara, the archlich Emperess of Srisia

Active/Unsent:

The Hall of Phantom Princes

The River of Drunholle, in service to the Prophetess of the Webweaver

Aibell, the First Banshee

Chalg'Ru, the Wraith King

The First Vilechant, whose identity is long lost

Possibly Mrendelfoth, the Hanged Man

The Pumpkin King, First of the Jack O' Lanterns

Ajsheema, the First Langsoir

The Order of the Dead Roses

Thoru, the Lost Guardian

Samanaur Tagrauk, Warrior-King & draugr

Azaka'an Aluar, Greatest Mummy Lord

The First Vampire, perhaps only a legend

The Grand Lich of Kael'Ras

The Colossus of Kael'Ras

The Necropolis

The Spider Hierarchs

Rhevalla Sris, the Prophetess of the Webweaver