Arthur stared at Gaia, who stopped teaching him for a while. The decision has not been made, but it has been made for him after he felt something calling for him from the world.
"The person you love is calling for you," said the core with sadness. "However, I fear that she has grown stronger than before, and her powers will damage more than just her body this time."
"I want to refuse what she is giving me back," answered Arthur with a shake of his head. "I want to stay here."
"I wish to have you here, but I need you to fight for me again, Arthur."
"I already refused that. I will not dedicate my life to anything."
"...I can show you something from the future. A scene that you will end up witnessing and must prevent. This is only possible because we are connected now, so please forgive me."