I had the privilege of making Mehrunes Dagon for The Elder Scrolls Renewal: Skyblivion. This Daedric Prince went through many iterations throughout the years, ever since I picked up Zbrush. The design is based off of original concept art by the amazing Kathryn Zalecka (Sythgara), which I improvised and tailored to both technical workflow limitations, practicality, and... my personal liking (with the team's approval ofcourse ;D). Branded across his torso are the glowing runes of Mysterium Xarxes of the Mythic Dawn. I figured the pentagram, and the triangle of from the tome would fit his body well to distinguish him from common Daedras. Rigged with Tweaked Advanced Skeleton rig
You can check out Kathryn's phenomenal works at:
https://www.artstation.com/sythgara

Original concept art by Sythgara https://www.artstation.com/sythgara