Updated: If you could create your own dragon priest mask what would it be called, is it light or heavy armour and what enchantments would it have?*
(*If one were to create their own dragon priest mask, some things should be noted: the dragon priest mask must have its name in the dragon tongue consisting of three words, it can only have a maximum of three enchantments similar in number to such masks like yolsung, otar, vokun, nahkriin & krosis and Whenever it's classified as light or heavy, what it's armour rating is & what it is made of[e.g it could be made of ebony, Iron, steel, moonstone, Dragon Bone/Scales, etc, It could even be Daedric.] remember, proper measures must be taken to balance such creations within skyrim and make sure the divine Akatosh approves of it for he will be watching...)
Also, you may even write a back story on your own dragon priest mask just to make it sound awesome.
As for my own dragon priest mask, mine would be called...
"Vuldiilthur" the mask of the Dark Undead Overlord.
It is Classified as Heavy Armour
Armour Rating: 50 (can be Improved with both Daedra Hearts & Ebony ingots but they both have to be used in the process since it is of Daedric origin.)
Materials: Daedric (combination of ebony ingots and Daedra hearts.)
Cannot be Disenchanted
Enchantments are listed below.
1: 10% magic resist while wearing other pieces of heavy armour* up to a maximum of 30% (excluding the mask itself.) 45% if the undead wearer happens to have Necromage from the restoration tree.
2: Mitigation of weakness to sunlight For Vampire Lords, this does not mitigate the fire weakness however.
3: Retains the effects of the Lord & Ritual Stones (hence the mask's name) if an undead* is wearing a full set of Daedric Armour (Including the mask itself since it is of Daedric origin)
[*it will only work if you happen to be a vampire lord.]
The True but Terrifying Backstory behind it all!
"A Dragon Priest had been conducting a rather peculiar ritual with some Draugr (as in the Draugr giving life force to the dragon priest little by little thus keeping the dragon priest sustained for eternity.) which had gone horribly wrong because of a fairly small group of pure-blooded vampire lords that were intruding on the premises. It was Because of them that one vampire lord in particular had precariously messed up the ritual in such a way that it started causing the ritual to go haywire and undoubtedly taken the dragon priest into another dimension! That one error had sent the Dragon Priest into the realm of coldharbour under the dominant rule of lord Molag Bal, because of what had just transpired, Molag Bal had seized the Chance and Imprisoned the dragon priest in his realm with his dark & terrifying power, & it was due to the atmospheric darkness of coldharbour that the dragon priest was losing his divinity to akatosh and slowly degrading to an untimely husk, Molag Bal could feel the divinity slipping from the dragon priest & when the Dragon Priest lost his divine connection, all that was left was the mask that the dragon priest bore. When Molag Bal had seen the mask that was left, he had done the same thing he did to create the first pure-blooded vampire! (With exceptions) He had taken a shred of his own blood and dropped some on the Dragon priest's mask, remaking the masks host out of thin air and cold foreboding Darkness with, Molag Bal was undoubtly Corrupting it into something far more Darker & Sinister in the process, the dragon priest had no doubt returned from the Dead with death defying results. For the first time in the history of Divines & Daedra, the dragon priest had not only been resurrected but it had became fully daedric, more powerful than ever, the Daedric Dragon Priest now serves Molag Bal in the realm of Cold Harbour, forever claiming souls in the name of his Dark Lord, The Daedric Dragon Priest would carry out his masters instructions with extreme Prejudice, whenever it would be to just claim souls or keep inventory of the souls that worked for their master. Because of the Daedric Dragon Priest's Sucessive Streak, Molag Bal had decided to name the Daedric Dragon Priest not only to be his Immortal Champion! but to forevermore be known as...
Vuldiilthur The Dark Undead Overlord!
It is rumoured that you could find this Daedric Dragon Priest in the Soul Cairn as he Claims souls in the name of Lord Molag Bal, but be wary for to find this Daedric Dragon Priest would be to face your own impeding doom, for not even Alduin could stand up to the Terrifying visage & Ultimate power of that which lay before him..."