Boshaft

Boshaft, known too as the Emperor's Spirit, is a liquor infamous for how terrible it tastes, despite having been served at the coronation of an emperor. Ages ago the elf Milliarde brewed a large stock of the bottles purely to fight off boredom, hid them behind a powerful barrier, and raised a stone marker carved in ancient elvish that praised the drink as the finest in all the world. The name also belongs to the sixty-ninth chapter of the manga by Kanehito Yamada and Abe Tsukasa.

About three decades after Himmel's death, Frieren's group passes through a brewing town in the Bier Region of the Northern Plateau, the sole stretch of the plateau with a granary. There they catch word of Fass, a dwarf nearing the end of a lifelong search for the legendary spirit. Raised in a town rather than the mines, Fass had taught himself to dig and bored his own tunnel toward the buried cache, guided by a legend and a stone monument he had uncovered two hundred years earlier. Once she recognizes Milliarde's elvish inscription, Frieren agrees to break the seal on the vault for twenty Reich gold coins, a sum able to fund the party's travels for years, and the task runs roughly three months.

Frieren keeps a private truth to herself, that the drink is cheap, foul hooch and that Milliarde carved the grand praise for no purpose whatsoever, just to kill time. When the barrier finally drops, the chamber stands crowded with well-preserved bottles. Fass pours a round, raises a toast, takes a sip, and meets the awful flavor exactly as Frieren had warned, yet he laughs it off and shares the find with the entire village. The scene echoes Heiter's old reply to her, that a drink pursued across a lifetime deserves to be enjoyed even when it disappoints, and Fass calls it the finest evening he has known.

Milliarde, the listless elf who brewed and concealed the stock, is its origin. Fass, the dwarf who poured over two hundred years into the hunt, is the one who at last recovers it, with Frieren lifting the barrier and Fern and Stark pushing her to accept the job. All three of the party taste the spirit beside Fass before the bottles make their way around the townsfolk.