From Diablo Wiki
Glenn "Raneman" Rane is a concept artist with Blizzard Entertainment. His primary work has been on the Warcraft and Starcraft series, but he's contributed to the Diablo universe as well, and was the artist responsible for the cover art of most of the Diablo novels (as well as Starcraft and Warcraft novels).
Some of Glenn's work in the Diablo universe:
Moon of the Spider cover.
Birthright cover art.
Scales of the Serpent cover art.
The Veiled Prophet cover art.
Female Witch Doctor painting.
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