Iron, Silver, Gold, and Mystic. What were the progressive advantages that a Pranic Beast experienced upon entering a higher Grade? An increase in physical might and body size, an increase in the mind's computing power and processing speed, and an increase in the presence and lifespan.
Body, mind, and soul became elevated on a fundamental level, reflected in the Prana used by the Pranic Beast as it evolved to higher Grades. Since Inala was doing the same, he pondered for a long time.
How does he best make use of this advantage, since he planned to enter the Mystic Grade conditionally? After a lot of time, by taking reference from Orakha's Compound Human Avatar, he had his answer—a compound Nature.