In fact, Souta could already level up his spell to level 10 with the help of the [Skill-level up cards] that he received. He just didn't do it because he thought that it would be such a waste to use it at this time.
He would be able to upgrade his class at any time.
Souta rubbed his chin as he thought about the reason why he would postpone the promotion of his class. He could do it right now, and his strength would greatly increase even though he couldn't use mana at the moment.
The Battle Mage class was entirely different from the Mage class. A mage class couldn't hope to defeat a battle mage class. The firepower and overall stats were higher than the mage class. Also, Souta would be able to gain the skill of the battle mage in his skill tree. Skills, as in combat arts, are related to the battle mage's specialty.
These combat arts would help Souta greatly now that he couldn't use mana.
'I'll think about it later...'