Skill Up & Ascension MaterialThe fang of a dragon. Dragon Tooth Warriors are created using these fangs.
America: Deming (Free Quest) is the best AP-saving location to farm Dragon Fang. You'll get around 6x Dragon Fang by spending 170 AP.
Babylonia: Eridu (Free Quest) is the best time-saving location to farm Dragon Fang. You'll get around 6x Dragon Fang by spending 210 AP.
Fuyuki: Mobile Coordinate No.0 (Free Quest) is the fastest location you unlock to farm Dragon Fang.
Here is a list of servants that need Dragon Fang to perform Ascension and Skill Up.
Rashoumon event (Ibaraki Douji event)
Murder at the Kogetsukan
Inheritance of Glory
5 Star Servants Tier List: Best Servants [5/9 updated!]
Saint Quartz Farming Guide
Ryougi Shiki MAX Ascension/NP Guide
Best Servants [★4]: 4 Star Tier List
Kara no Kyoukai (The Garden of sinners) Event Rerun [JP]
Anastasia Nikolaevna Romanova
Device Transfer Guide
Oda Nobunaga (Berserker, Summer 2017)
Grand Puppet Master (Grand Puppeteer)
Lone Man's War