Wondrous Item, artifact (requires attunement by a dragonborn)
This mask is the burial mask of an ancient king who worshipped Tiamat. When worn by a dragonborn, it makes them immune to poison damage, the poisoned condition, and any disease (magical or nonmagical). You also gain a +2 bonus to AC.
Notes: Immunity: Poison, Immunity: Disease, Immunity: Poisoned, Bonus: Armor Class, This mask is based on Hevnoraak, the dragon priest mask from TES V: Skyrim. The original enchantment reads: The wearer is immune to poison., dragonborn, Buff, Headwear
Any suggestions for improvements are more than welcome.