The Invisibility Potion is one of the top achievements of the pharmacists from the Ovillan Society, and within its formula lies the renowned Siren's Tears. The tears of sea monsters are so precious that even after traversing the storm-ridden overseas and reaching the Misty Kingdom—the legendary land of the giants—where mortals rarely tread, these mythical creatures, who with their enchanting voices lure sailors to their doom, are scarcely seen and difficult to encounter.
A pristine Rock Shark's Long Horn is already a rarity in the Cloud Sea region, and they can fetch astonishing prices in the bustling markets of Elpaxin and Golande. Compared to these, the tear-filled crystal bottle of the sea monsters, brimming with magic power, is worth a hundredfold more.
Even though the pharmacists carefully add only a tenth of the required dose when brewing the Invisibility Potion, its price is still inflated to an exorbitant amount on the black market, nearly ten thousand Lycel per bottle.
