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
FGO Reroll Tier List [5/11 updated!]
Device Transfer Guide
How to farm EXP cards & level fast
Best Craft Essence: Craft Essence Tier List
Talon of Chaos (Claw of Chaos)
Glassful Sweet Time (Glass Full Sweet Time)
Minamoto no Yorimitsu (Berserker)
Mysterious Heroine X (Assassin)