To get this Spirit, you must first unlock the Finger Ruins of Dheo, located in Scaduview ... this zone until you find the entrance to a cave. Drop here, and a giant Fingercreeper will attack ...

Ymir will send you to find the Finger Ruins of Dheo. Talk to Ymir, rest at the Site of Grace nearby, and then return to Ymir's chair. You'll see he's no longer there, but you can examine his chair ...

You also can’t complete Count Ymir’s Questline without accessing this area, as the path to Finger Ruins of Dheo starts from here.