Netherbeast, and Provocation

On their way there, Arthur explained the two threats coming his way and how they did not have the power to win against them.

Wisa and Jane were also rank-four mages now, but even if all of them acted together, they still had no means of overcoming the menace that would come. So their best course of action was to flee the planet — they would have to leave either way if they wanted to pursue the magical path to its fullest.

"So this beast in the cave gave you another incredible eye, and it said you must get all the eyes if you want a chance against the other universe?" Wisa said.

"Pretty much it, yeah. The eye in my main body can help me track the others and get them while increasing our power. This other universe is idle now, but clues indicate that they might attack us in the future, and in our current state, we don't have the power to contend against them."