Skill Up & Ascension MaterialOminous bones wielding curses.
Fuyuki: Unknown Coordinate X-C is the best AP-saving location to farm Evil Bone. You'll get around 2x Evil Bone by spending 40 AP.
Fuyuki: Unknown Coordinate X-C is the best time-saving location to farm Evil Bone. You'll get around 6x Evil Bone by spending 150 AP.
Here is a list of servants that need Evil Bone to perform Ascension and Skill Up.
Rashoumon event (Ibaraki Douji event)
Murder at the Kogetsukan
Inheritance of Glory
5 Star Servants Tier List: Best Servants [5/9 updated!]
1-3 Star Servants Tier List
Saint Quartz Farming Guide
Anastasia Nikolaevna Romanova
Jeanne d’Arc (Alter)
Caster of Midrash (Queen of Sheba)
We'll Conquer the Ocean of Stars
Holy Shroud of Magdalene