Asta and the other Magic Knights chosen to train in the Heart Kingdom are joined by Magna and they finally start their training under Loropechika and the Spirit Guardians of Lightning, Earth, Plants, Fire, and Wind and Undine. Since Asta has no magic to begin with, he ends up sparring with Gaja, the Spirit Guardian of Lighting.  They Magic Knights all work harder to surpass their limits.
So this is the Heart Kingdom's technique.
.هذه هي تقنية مملكة هارت إذًا
Das sind also die Zaubersprüche
des Königreichs Heart?
¿Estas son las fórmulas del Corazón?
¿Estas son las fórmulas del Corazón?
C’est donc ça,
un rituel magique du royaume de Heart ?
E così è questa la tecnica del Regno di Heart...
Então esta é a técnica do Reino Heart...
Это и есть колдовство королевства Черв?..