File:Warcraft 3 concept art Lich.jpg

Summary
"Lich Concept" Ru Weerasuriya, c. 2001 Digital Painting Warcraft III: Reign of Chaos

On the official Warcraft III site, this image was captioned: "'During [his] mortal life as the Warchief of the Orcish Horde of Draenor; Ner'zhul commanded a number of Orcish Warlocks and Shamans. Yet, when these wicked sorcerers were captured by Kil'jaeden and the Legion after the destruction of Draenor, they were transformed into twisted aberrations of their former selves. These Liches possessed tremendous magical powers, yet their immortal, undead bodies were bound to the iron will of Ner'zhul. Since the Liches showed unswerving loyalty to their master, Ner'zhul granted them control over the furious elements of the cold north. Now, Liches wield frost magic along with their own considerable necromantic spells.'"

Source
BlizzConline, Warcraft Art Gallery:
 * Website
 * File link

Blizzard Entertainment, Warcraft III site:
 * Previous sources
 * Web page
 * File link

Scrolls of Lore:
 * Web page
 * File link