Here's the official blurb on Xiao:.
"Wielding a polearm and the power of Anemo, Xiao is a fierce adeptus warrior whose elemental burst grants him increased damage at the cost of continuously draining his health.During the Lantern Rite, Travelers will have the chance to accompany Xiao for a day in the life of a guardian of Liyue, offering a rare glimpse into his life of solitude over the past millennia.".
Ghost of Tsushima - Mythic Tales locations: Where to find all musicians and get Mythic armour rewards
Where to find and how to complete all Mythic Tales in Ghost of Tsushima