Simply maintaining the Sin Beast state without using any power... actually consumed very little mana.
Iver spent half a day studying it with Grey, and only lost two standard units of mana.
In other words, he needed one point of mana roughly every three minutes.
This meant that, if Iver wanted, he could maintain this state almost indefinitely—even without devouring the Sin Thorn.
In this state, Iver could not pray to the Candle Holder to restore his mana, but 284 points of mana would allow him to maintain the transformation for about fourteen hours.
Considering that this was basically Iver's ultimate move... instead of hiding it until combat and using it blindly on his first attempt, he might as well let a reliable and trustworthy Scholar study it first and develop its applications a little.
After all, in the Sin Beast state, Iver could only use the abilities of the Dedication Path. In other words, he could no longer use the Great Sin Card to switch into the Great Sin Beast or cast spells. This meant that his transformation might actually reduce his combat strength... Moreover, the more mana he used in the Sin Beast state, the more irreversible the conversion would become. Therefore, he absolutely could not transform recklessly.
After confirming the mana costs and effects of his other abilities, Iver said solemnly to Grey, "I'm going to begin the treatment."
Grey nodded nervously as well. She touched her amberized eyeball one last time, confirming its texture, then closed her eyes.
Iver did not know how he should treat Grey.
He could only rely on his instinct and use his wish-granting ability.
He lowered his head slightly and pressed the antlers burning with white flames against Grey's head. Yet Grey felt no searing pain. Instead, a continuous warmth flowed