Months after arriving at the Heart Kingdom, Asta still doesn't have any magic, but he's become more powerful at an alarming speed due to his training with the Spirit Guardians. Anti-magic is one of the magic attributes that falls into the "Arcane Stage" and is needed to defeat the devil. And because of that, Gaja asks Asta how exactly he obtained the five-leaf grimoire...
This "ki" is the best fighting technique 
you could use, since you cannot use magic.
هذا الكي هو أفضل تقنية قتالية يمكنك استعمالها
.بما أنّك لا تستطيع استعمال السحر
Dieses „Ki“ ist für dich, ohne jegliche magische
Kraft, die am besten geeignete Kampftechnik.
El ki es muy útil
para alguien sin poder mágico.
El ki es muy útil
para alguien sin poder mágico.
Ce que tu appelles le ki
Questo "ki" è la tecnica di combattimento più adatta a te, 
dato che non possiedi mana.
Este "ki" é a melhor técnica de luta que
você pode usar, já que não pode usar magia.
Видимо, это самое «ки»… для тебя,
лишённого маны, лучший помощник в бою.