Fine-tuning
The day was going to set when Eren was done with his business in the Novice's Treasury. Eren had a hearty supper in the canteen before heading to his dorm room. He needed to re-learn the spells he had bought.
That's right. Eren had already learned these spells in his past timeline. He had selected the same spells because it would be easy for him to execute them because of his previous familiarity.
Eren remembered the spells just fine. But he bought the spell scrolls so that he could explain their origins when he executes them in front of the students. He would be able to cast them without having to worry about coming up with explanations.
Eren locked the door behind him and sat cross-legged on his bed. He first opened the spell scroll of Rayo, the spell he was most familiar with. He analyzed the mana pathways and mana points that needed to be activated in sequence inside his body for the spell to get activated.
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