Ythryn Scout Mask.

A magical item popular in ancient Netheril. Originally invented by a mage from the flying city of Ythryn. According to the discovered records, they protected groups of scouts in the exploration of the frozen north, while searching for the giant realm of Ostoria.

With the fall of the city of Ythryn, the masks became a very valuable item, lost in the depths of time.

The mask provides full protection of the mouth and nose, allowing you to survive the bitter cold and breathe even in the frosty waters of arctic glaciers. The wearer of the mask gains resistance to cold, and if he already has this trait, he gains complete immunity.
Once a day, the mask allows you to cast the Water Breathing spell, without the need for components or spellcasting skills.

The perfect combination of adamentine plates and high-quality leather gives the item magical durability. Runic spells placed on the mask's surface and its intimidating appearance provide advantage on intimidation checks. If you lose a skill check, the mask's effect will no longer affect your opponent until the next day

Once attuned to the user, the mask cannot be removed without the owner's will.

Notes: Resistance: Cold, Advantage: Intimidation, all, Buff, enchantment