Asta and the others safely return to the Black Bulls' base after defeating the Eye of the Midnight Sun and the Diamond Kingdom in the Witches' Forest. Now that Asta's arms have healed, the Black Bulls as well as Yuno, Klaus, and Mimosa are relieved. However, there's no telling when the Eye of the Midnight Sun or the Diamond Kingdom will try to attack the Clover Kingdom again. Klaus then brings up a proposal to Yuno and Mimosa.
They are the ruined remains of the 
magic swords used by the elves' leader.
.إنّهما بقايا السيفين السحريين اللذين استعملهما قائد الإلف
sont des reliques
qu’utilisait jadis le chef des elfes.
Sono i resti mal conservati delle spade magiche 
del capo della tribù degli elfi.
São espólios das espadas
mágicas que o líder elfo usava.
это осколки магических мечей,
принадлежавших правителю эльфов.