This mask is the burial mask of an ancient king who worshipped Tiamat.  While wearing this mask, the number of attacks you can make each turn is increased by 1, and you have advantage on all Constitution saving throws and death saving throws.  In addition, your AC increases by 2.

Notes: Bonus: Extra Attacks, Bonus: Armor Class, Advantage: Constitution Saving Throws, Advantage: Death Saving Throws, This is based on Rahgot, the dragon priest mask from TES V: Skyrim. The original enchantment reads: +70 stamina., dragonborn, Buff, Combat, Headwear