Guilder
03-27-2019

Part of the Proof of Mythology (No.1) Memorial Album. This item drops randomly (and at times, rarely) from the mighty Minotaur, rumored to lurk deep within the Labyrinth endless dungeon.

You have a chance to run into this foe every 10 floors, but it's quite rare -- the Seeker of the Unknown title may help you find the Minotaur more frequently, though not by much.

Due to the Minotaur's elusive nature, I cannot presently confirm which version drops this item (the deeper you go, the more powerful it becomes, and its loot table changes depending on the version). Sorry about that, chief.

This item is Land Battle related, and seems to work the same as Analeptic -- using it revives one of your fallen party members in any land battle (outside of those fought in endless dungeons like the Labyrinth, ironically). However, JP wiki states that there is one benefit to it: this item only takes 15 seconds to revive, compared to Analeptic's 30 seconds.

Well, now you know. Happy mythical monster hunting to you. Cheers.

Guilder
03-27-2019

Oh, right. For what it's worth, JP wiki suggests Minotaur floor 20-40 versions have a chance to drop this. Your mileage may vary -- the JP wikis aren't always accurate compared with international servers.