"You want to be strong?" Eiro asked, looking Charles deep into his eyes. Nervously, the young man nodded his head, not sure about what Eiro was going to say to him now.
"Then start with finishing feeding your sapling your mana every day. Once you do that and there's enough wood to make prosthetics out of it, you'll have limbs that will literally act as staffs do, meaning you'll be able to cast magic using them. That alone is quite an upgrade compared to your current state." The Demon pointed out bluntly, "And after that, instead of practicing in here, go look at some spellbooks that your school offers to you, or just the ones that you have here in the castle, and keep on practicing. Increase your skill levels, and you will naturally become stronger."