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...
Ki is the blanket term for all of 
the different types of life energy
الكي مصطلح جامع لكلّ أنواع طاقة الحياة المختلفة
repräsentieren die Lebensenergie,
die Menschen ausstrahlen,
Ce terme de ki englobe
tout ce qui émet de l’énergie vitale.
"Ki" è un termine che racchiude
tutti i diversi tipi di energia
O Ki é o termo usado para todos
os diversos tipos de energia vital
всё это есть у каждого человека,
а вместе называется словом ки»!