Every Chronicle had something special. In First Chronicle, it was Beyond, in Second Chronicle, it was Martial Essence, in Third Chronicle, it was Concept. The higher the Chronicle was, the stronger the unique characteristic of that stage, and the Fourth Chronicle stood out among the others. Humans on this Chronicle were strong enough to fight young dragons, and achieving that strength was a real challenge.
The Form was a special ability that could be mastered in the Fourth Chronicle, but only the most capable and talented could do so.
Using the Form was the ultimate trump card that fighters would use only as a last resort. A fighter had to make sure that nothing else posed a threat by the time his energy ran out.
'Maybe I should join too?' Osvald pondered watching Zariel's transformation.