Protagonist's Martial Soul Explained

The protagonist's Martial Soul is not a physical skeleton.

He is Malignant Mutation.

The Martial Soul Avatar is the armor- Susanoo (Ice and Fire Attribute).

The protagonist's Martial Soul Mutation, so it cannot be released externally.

Because it cannot be released externally, the Martial Soul can only reside within the bones.

Because it's inside the skeleton, the Martial Soul inherits the characteristics of the skeleton.

Because of its skeletal characteristics, initially, a skeletal pattern will appear on the surface of its body.

However, in reality, the protagonist's Martial Soul is not a skeleton, but an energy-based armor in the shape of an incomplete skeleton.

The protagonist's energy-based armor Martial Soul is an incomplete mutation resulting from the fusion of his father's Ice Turtle Shell Martial Soul his mother's Fire Attribute Martial Soul.

If the protagonist chooses Spirit Ring that enhances bones at the beginning, then there will be a problem, because it's not a bone enhancement spirit ring.

Therefore, in the story, the protagonist's First Soul Ring is an energy-type Spirit Ring that harmonizes Ice and Fire Attribute. This is also the protagonist's subconscious choice.