Secret Gem of Caster
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Table of Contents
Best Drop Locations
Best Drop Locations
APD = Avg AP Per Drop
The most efficient quests to farm for the item. Lower is better.
Drop rate estimates based on data collected by /u/Rathus and the Grand Order Subreddit
5th Skill Enhancement
6th Skill Enhancement
5th Append Skill Enhancement
6th Append Skill Enhancement
213
Posts
18293
Entries
Contributors
Servant Tier List
Servants
Summon Banner List
Summon Simulator (JP)Olga Marie Quest_1Lostbelt 7: Nahui Mictlan - Spoiler-free Walkthrough
Summon Simulator (NA)Rabbit's Reviews - ArchiveOrdeal Call Bleached Earth - Olga Marie QuestsOrdeal Call Bleached Earth - Free Quests
Larva / Tiamat (Archer)
Ryougi Shiki (Moon Cancer)Hunting Quest Part 13Ordeal Call I: Paper Moon - Spoiler-free Walkthrough
E-Flare MarieOrdeal Call Bleached Earth - Challenge QuestsRabbit’s Reviews #424: Ryougi Shiki (5* Moon Cancer)FGO Summer 2025 - Walkthrough
Grigori Rasputin
Passionlip (Saber)- Ordeal Call New Duties Unlocked: Part 2
BB (Summer)
Larva / Tiamat
Miyu Edelfelt (Lancer)
U-Olga Marie[High Difficulty] Legendary Water Source
Mystic Codes
Huyan Zhuo (Berserker)Lostbelt 7: Nahui Mictlan - Main Quests
Altria Caster (Berserker) 
Aesc the Savior
Senji Muramasa[High Difficulty] Legendary Water SourceMMM - Proselyting Primary-Schooler Performs Purification, Passive to Perfunctory Planetary Perciever of Passing (Summer 2025 Part 2)
Jeunesse CraneFGO Summer 2025 - Tier List Change LogRabbit’s Reviews #421: U-Olga Marie (5* UnBeast)MMM - Marie, Merrily Migrating to Mediterranean Miracle, Marvels at Massive Mammaries on Majorly-Maligned Maiden (Summer 2025 Part 1)
OberonAdvanced Quests
Kriemhild (Rider)
Tezcatlipoca
Scathach-Skadi (Ruler)
Craft Essences
Altria CasterFGO Summer 2025 - Quick Farming Guide
Mash Kyrielight
Space Ereshkigal
