"So, a human who ingests the Heart Blood thing of the Golden Savages transforms into Bronze and Silver Savages? Tell the demon the answer."
"Yes. If you get more Heart Blood, you can become a Silver Savage but if you were unlucky, you can only be a Bronze Savage because the Golden Savages won't give you enough HeartBlood to turn your own Heart into silver."
"How does your power work?"
"The stronger my heart is, the stronger my body will be. As for my power, the defensive Savage Magic—Glass Dome, you have to learn to use it by training on it. Any savage can train it, but only a Golden Savage can train two Savage Magic at the same time. As for Bronze and Silver Savages, we can only train one Savage Magic in our lifetime."
Now, it made sense that he saw many Savages with similar powers.