Recklessness
With that much power, the sea emperor and his beasties could create their own path in the human territory and then move toward all cities and towns to destroy every single one of them, and they wouldn't be able to do a single thing against it.
"You don't look very impressed. I knew that father could do that, but I feel goosebumps while seeing this," Seadir said while showing a nervous smile.
"I am the type of person who uses situations like this to learn as much as possible," Rain explained. "Instead of getting nervous, I prefer to choose to analyze the situation and gain some things in exchange. Like the fact that, possibly, these creatures are somewhat bound to your father's spear. Was your father able to control them as soon as he was able to hold the spear?"
"Eh? I am not sure…" Seadir frowned.