The Yiga Mask is an armor piece found in Tears of the Kingdom.
Tears of the Kingdom
"A mask supplied to members of the Yiga Clan. It covers the entire face, keeping even breath sounds to a minimum. Perfect for sneaking, but lacks protection due to its light material."
Enhancing Armor requires that Link has unlocked as many Great Fairy Fountains as the desired star-level.
|★||3||2 x Octorok Eyeball
|★★||5||3 x Fire-Breath Lizalfos Tail
3 x Puffshroom
|★★★||7||5 x Ice-Breath Lizalfos Tail
5 x Keese Eyeball
|★★★★||12||5 x Electric Lizalfos Tail
3 x Black Hinox Horn
10 x Mighty Bananas