Camelot : Wastelands of Death (Free Quest) is the best AP-saving & time-saving location to farm Chain of the Fool. You'll get around 6x Chain of the Fool by spending 190 AP.
Rashoumon event (Ibaraki Douji event)
Murder at the Kogetsukan
Inheritance of Glory
How to Complete Master Missions [US May 7 - May 13]
Best Craft Essence: Craft Essence Tier List
5 Star Servants Tier List: Best Servants [5/9 updated!]
Caster of Midrash (Queen of Sheba)