Refined bone

Refined bones are made from combining 5 sturdy skulls together. Sturdy skulls are collected from salvaging Fetishes, and the fetish that i specifically used was the Sacred Fetish found in the artificer recepie vendor in sanctum. To craft the fetish, you required 2 hollowed bones, 1 bloody fang and 10 mats brought from the artificer. Hollowed bones and bloody fangs drop for me from mobs around stillmore, specifically, the bats in the NW of stillmore.