http://www.nexusmods.com/morrowind/mods/42928/?
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"The Indoril masks were official, and they each depicted his true visage. There was also a special Daedric helmet version in the Morrowind Art Book, but its look depicted his more terrible aspect as Hortator and Padomaic champion."
http://www.imperial-library.info/content/forum-archives-michael-kirkbride
After Nerevar's death, his remains fell into the hands of the Tribunal priesthood. His belongings were scattered: his blade broken, his signet ring lost, his signs of office divided among the Houses. His war-mask, though, was kept by the Temple, who built a shrine for it on the shores of Lake Nabia. In time the veneration of Saint Nerevar waned: his great actions became mere lines in the annals of the Tribunal's greatness, and Ashlander heretics clung to his name. The remote temple of Ashur-Anit was abandoned, and lost forevermore to the shifting ashes of Molag Amur. Lost? Not quite. Not anymore, at least.
This mod adds a large, detailed multi-level dungeon in the Molag Amur region, intended for higher-level characters. Fight plunderers, Daedra, and revenants, all for a very special reward: the Face of the Hortator, a unique lore-friendly Daedric helmet, hinted at by the developers.
Look for a mine entrance with a red lamp on the north shore of lake Nabia. (follow the river north from Suran, or go east across the Dwemer bridge from Balmora. Or take the propylon to Marandus).
Screenshots:
http://static1.nexusmods.com/15/mods/100/images/42928-1-1386192284.jpg
http://static1.nexusmods.com/15/mods/100/images/42928-3-1386192285.jpg
http://static1.nexusmods.com/15/mods/100/images/42928-5-1386192285.jpg
http://static1.nexusmods.com/15/mods/100/images/42928-2-1386192284.jpg
http://static1.nexusmods.com/15/mods/100/images/42928-4-1386192285.jpg
http://static1.nexusmods.com/15/mods/100/images/42928-3-1386192305.jpg
http://static1.nexusmods.com/15/mods/100/images/42928-1-1386192304.jpg
http://www.nexusmods.com/morrowind/mods/42928/?
====================
This is my first published mod, so any bug reports and criticisms are more than welcome!
Keramac/Infragris