Yamaneko's Eyepatch is an eyepatch from Iki Island that once belonged to the raider captain Yamaneko. You can only claim it after two side tales, then a trip to the Shattered Cliffs coast.
Finish "Troubled Waters", then "Bloodletting". Once both are done, ride to the coast below the Shattered Cliffs on Iki and pick the eyepatch up there.
You take the eyepatch from Yamaneko's body on that shore, after the events of Bloodletting.
Sugi's Kasa Hat
Sugi's Kasa Hat belonged to a well-known former raider. You can only collect it after finishing the side tales "Troubled Waters" and "Bloodletting", near Thieves Rest Lighthouse.
Charm of Descending Talons
The Charm of Descending Talons is a minor Melee charm from the Iki Island expansion in Ghost of Tsushima. Jump attacks can stagger and knock enemies down, and the higher you drop from, the more damage you do. You get it by finishing the tale Bloodletting.
Charm of Fleet Foraging
The Charm of Fleet Foraging is a minor Utility charm from the Iki Island expansion in Ghost of Tsushima. Melee kills have a 15% chance to give back quickfire ammo. You get it by finishing the tale Troubled Waters.
A Scrawled Message
A Scrawled Message is a written record from the Records of Iki set, left by locals during the Mongol invasion. You find it at a camp south of Lake Nagata on Iki Island, and it counts toward the Avid Reader trophy.