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Hopefully, we all know the story of the Dragon Cult, and how the ancient tyrannical dragons of Akavir gifted their most loyal with these horrible masks powerful enough to enslave men by force.
After many days of searching and ridding the world of Alduin (perhaps only for the moment), Archmage Amadeus had finally defeated the last of the Dragon Priests, and obtained all eight of their masks.
The Archmage was already a force to be reckoned with, a master of the schools of Conjuration, Restoration, Illusion and Destruction, who had also been gifted by Akatosh with dragonblood and the Voice. The ebb and flow of the battlefield were his to control, causing absolute mayhem, mass hysteria or peaceful harmony among his enemies at a moment's notice--and changing them when he saw fit. He was able to summon, even permanently, many Deadra, including the powerful Atronachs, each the embodiment of the elements themselves--the elements Amadeus also controlled.
Though just at heart, any evil foolish enough to oppose him became his plaything as he commanded his enemies, summoned powerful allies, and willed the very weather. The dragons themselves were not safe against this Dragonborn wizard: Amadeus could call upon lightning from his hands, the sky, and Deadra to tear the flying beasts asunder, or shout them to the ground to burn and blister them with the power of fire and ice, destroying the dragons with a hellish firestorm within a blizzard. Any wounds--if they could be inflicted--were instantly healed, though more often than not, Amadeus found himself in the protection of holy Restoration magics, using wards and preserving whole chunks of the battlefield to himself, and he was under the magical protection of the Lord stone. More quickly than he had realized, Amadeus had many options just to set the undead on fire and force them to flee, among other things.
All this power, and yet the Archmage had more at his fingertips: the Dragon Priest masks.
In his younger days, before he became the master of the College of Winterhold, the undead priests proved a powerful challenge to him. Krosis was fought first alongside a dragon, but with a Flame Atronach and the power of magefire, Amadeus brought them down. Krosis' mask was perhaps useful--it enabled its wearer to create more potent poisons and potions, pick locks more deftly, and even strengthened one's bow arm--but these enchantments would aid the budding mage little.
It was Krosis' Staff of Fireballs that proved useful in his next battle against Morokei, and a scroll that conjured a Storm Atronach helped fell the priest. And from Morokei, his mask: enchanted with an enormous growth to the wearer's magicka, Amadeus was able to defeat the evils plaguing Winterhold and become Archmage. From that point forth, he grew exceedingly powerful, and the rest of the Dragon Priests fell to him, one by one, with ease.
It was upon obtaining the eighth and final mask that he made his way back to Labyrinthian, where he first fought Morokei, and to the Bromjunaar Sanctuary, where the Dragon Priest masks were originally housed. There, he found a similarly shaped wooden mask, with no apparent special properties...
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At this point in the game, I used the eight masks to unlock the ninth, and I realized that the sanctuary made a good housing for them. Then I thought about how powerful my mage truly is, and it's all thanks to the masks. Specifically, I switch between three in particular: Morokei, Nahkriin and Otar. Between any of these three, I was already game-breakingly powerful, and there's no telling how much stronger Konahrik would make me.
Standing back in time (is this the First Era?) wearing the Wooden Mask, I resolved: these masks are too powerful. Too powerful for me, too powerful for anyone. I'm the Archmage for a reason, already far strong enough to take down a pair of Ancient dragons in mere seconds (certainly under a minute). There was only one thing I could do.
I placed all nine masks on their busts...and released the Wooden Mask. It fell to the floor of the sanctuary, and with no mask, I was thrust forward in time to the present-day ruins, just as the wooden one hit the stone floor.
There are no more masks. No great power to be abused. They are forever sealed away by time, in an era long forgotten.
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The Archmage walked out of the sanctuary and was greeted by his horse, Allie. Together, they rode in the calm night to Solitude. Allie was stabled outside the city in Katla's farm, where Amadeus lent a working hand the following morning and contemplated on what he had done.
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Just for clarification's sake, here are the masks and their enchantments--and what I'm now missing:
The three I used most often:
Morokei: Magicka regenerates 100% faster. (Light Armor)
Nahkriin: +50 Magicka, and Destruction and Restoration spells cost 20% less to cast. (Heavy Armor)
Otar: Resistance against fire, frost and shock is improved. (+30% elemental resistance, Heavy Armor)
The others:
Hevnoraak: Immune to disease and poison. (Heavy Armor)
Krosis: Lockpicking, Archery, and Alchemy are 20% better. (Light Armor)
Rahgot: Increases your stamina by 70 points. (Heavy Armor)
Vokun: Conjuration, Illusion and Alteration spells cost 20% less magicka to cast. (Heavy Armor)
Volsung: Prices are 20% better, Carry 20 points more, and can breathe underwater. (Light Armor)
The ninth mask:
Konahrik: When health is low, has a chance to heal the wearer and damage nearby enemies. (Heavy Armor)
Konahrik can also summon a spectral Dragon Priest (presumably the priest for which the mask is named, whom you never fight), who, among other attacks, will summon a Storm Atronach or raise undead. It can heal you and any allies around you while simultaneously pushing away all foes around you as well as putting a flame cloak on you, and can grant you thirty seconds of unlimited shouting.