In reading order
The Vampire King
Heather Killough-Walden
The Phantom King
Heather Killough-Walden
The Warlock King
Heather Killough-Walden
The Goblin King
Heather Killough-Walden
The Seelie King
Heather Killough-Walden
The Unseelie King
Heather Killough-Walden
The Shadow King
Heather Killough-Walden
The Winter King
Heather Killough-Walden
The Demon King
Heather Killough-Walden
The Shifter King
Heather Killough-Walden
The Nightmare King
Heather Killough-Walden
The Dragon King
Heather Killough-Walden
The Time King
Heather Killough-Walden