Babylonia: Reed Fields (Free Quest) is the best AP-saving & time-saving location to farm Stinger of Certain Death. You'll get around 6x Dragon Fang by spending 210 AP.
Rashoumon event (Ibaraki Douji event)
Murder at the Kogetsukan
Inheritance of Glory
Best Craft Essence: Craft Essence Tier List
Device Transfer Guide
FGO Reroll Tier List [5/11 updated!]
Assassin
Ushiwakamaru
Forbidden Page
Chaldea Lunchtime
Ereshkigal
Arthur Pendragon(Prototype)
Gorgon
Black Holy Grail (The Black Grail)