As he escaped, he checked the weakened blue flame. This blue flame came from his prototype core. The more he uses it, the weaker it will become. He didn’t want to use it too much before reaching the Core Formation stage because he believed that it getting weaker would affect his chance of breaking through.
Although it was powerful, it was like something without a root. Every time it was used, it would shrink a little. Back in the fourteenth valley, he didn’t really use it; he relied on its ambient temperature to melt the ice.
But when used to kill an enemy, it was very different. It wouldn’t be too bad if it could simply kill an enemy without much resistance, but if he were to start fighting against the enemy’s treasures, the flame would get used several more times than normal.