Bab 681: The Incoming Battle.

'Who is this human?' Asmodeus wondered while getting squished by the ground as he was buried deep in Mars' soil.

'He isn't normal human. None of us expected a human to reach this level. Lucifer would be surely interested in him.' He thought to himself while trying to move his neck. He glanced at the orange soil, thought for a moment and then took a huge bite.

Crunch, crunch, crunch.

Asmodeus started munching on the disgusting, dusty, and cold ground like it was food. As soon as the soil traveled to his stomach, his jaw healed immediately, and so did the rest of his body.

Ordinary demons could only increase their healing speed by eating flesh and drinking blood, but Demon Kings could increase their speed of healing by eating anything. That was a gap in Primordial God's knowledge and apparently in Isaac's knowledge as well.