Dropped by
Configured rates, and the rate after the server’s drop multipliers
Driller 
Frilldora Observed drop rates per monster are on each monster’s page.
Used in
Recipes that take Frill as a material or guide · all recipes
Fireproof Potion Pharmacy · Prepare Potion 1
Red Gemstone 
Empty Potion Bottle 
Elemental Potion Creation Guide Sold by
NPC shops
No NPC sells this item