The shaman's headdress add-on is an item obtainable from Treasure Hunter or obtained from a box of summoning ingredients from Familiarisation. It can be used on a shaman's headdress to create a modified shaman's headdress. Once the add-on has been added to the shaman's headdress, it cannot be undone. Upon adding it on, you get the message: "Congratulations! You have upgraded your skill outfit headpiece. It now has additional abilities - give them a try!"