Amberser used True Polymorph to permanently turn Aeolus into a crab, yet, after death, his rebirth was exactly the same, without any variation.
[Mute: So, can you really only control him using your Time Stop Effect?]
Amberser shook his head and said, "I don't know, I'm just speculating. If the time stop state is also deemed as death, then I truly have no way to control him."
Aeolus's ability was indeed outrageous, but Amberser also discovered one weakness in it.
His power was constant and unchanging; in their several encounters, Amberser felt Aeolus had become stronger, but the strengthening was only in his combat skills, not his absolute power.
In other words, with each rebirth, the amount of seawater he could control remained at the same limit; it was only that he used it more skillfully and effectively each time.
