The concept the fountain of life made was very powerful but it couldn't control it yet. That meant t couldn't become a Sovereign of life. It is a powerful creature that can already kill Origin gods but it will die as a titan because it bit more than it could chew. That would be very pitiful and it didn't want that for itself. So it sought to empower its inner world and grant it control over the concept. That's why it came to this plane.
The Fountain of life said after understanding its motives and purpose, "The Life crystal is very important to me. That tiny Warrog girl threatened my chances of getting it so I killed her. You are threatening it now so you must die."
Ragnarok said with glee, "Is that so? Then bring it on. I am not going anywhere." Ragnarok said with glee.