7th Singularity Babylonia: Cutah free quest is the best AP-saving & time-saving location to farm Ghost Lantern. You'll get around 3-4x Ghost Lantern by spending 210AP.
2nd Singularity: Mt. Etna free quest is the first location you unlock to farm Ghost Lantern.
5 Star Servants Tier List: Best Servants [5★]
Best Servants [★4]: 4 Star Tier List
1-3 Star Servants Tier List
Valentine event: Chocolate Lady's Commotion [US 2018]
Nero Claudius (Bride)
FGO Reroll Tier List
Jack the Ripper
Talk on the Heated Sands
Street Choco Maid
Kitchen ☆ Patissiere
Holy Night Supper