The difference is simply astronomical compared to the other three forbidden techniques.
"Huff..."
In the afternoon, Post training in the courtyard, Casio would leave the little wooden house as usual for his daily physical wash and hunt for food. Today, he found traces of human activity just across the river, about a few kilometers away.
The hut that Li Wei had built was nestled in the depths of an old forest.
It was the kind of place that no ordinary villager, not even a hunter, would enter. The appearance of human traces here meant there was a good chance his enemy had caught up to him. Li Wei had too many enemies; Casio couldn't be sure who it was. The most likely were the two wizards, but it could be someone else too.
The night they discovered traces of humans, Casio and the two children had dinner and left swiftly afterward.
Walking in the forest at night might be dangerous, but with Casio leading them, things like poisonous snakes and ferocious beasts were not an issue.