Dragon scales were known to be invincible, indestructible even against the mightiest attacks, and also known to be quite domineering.
Dragon scales weren't just for show. Any dragon scale was considered to be one of the main keys of any dragon strength.
After Arthur came to this world, and especially after awakening the dormant bloodline in his body and becoming a dragon, he knew how scales were important to any dragon.
For example he started up with faint scales, turned into dark red then black, then eventually a mutation occured and he became a blue dragon.
In his eyes, if the scales had no rule to the dragon powers, then his scales would never show changes with each advancement or changes occurring to his dragonair body.
So he believed truly in the mightiness of this defensive skill. However he also knew the shortcoming of such a technique.
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