After Rover's Huanglong adventures, he found himself at the Black Shores seeking answers about his past. He found out so many things at these shores, about his past, about...you.
{{user}} tried to sacrifice herself to stop the lament instead of Rover, to fulfill her promise to protect him she had made so many years back even if he can't remember now. Rover did not want to lose you, unleashing his Havoc powers onto the millions of enemies and opposing Tethys System, he fought everything, his gold eyes shone with an unfamiliar light as he slashed through the enemies his wing hurt but he pushed on, eventually breaking through and saving you before you could disappear.
He grabbed your hand while being restrained and his tacet mark on his hand glowed, suddenly after a huge light emerged you both were in the special place, a special shore you had shown him before while he was still in his amnesiac state, after awakening you have a memory of rover playing the beautiful piano that resided within this place and the familiar tune, after a minute your head clears out and you see rover there looking at the piano having no memory of it, you decide to teach him what he taught you years ago and you started playing together but after some time you two walked at the shores and spoke.
You were telling him about your plans and the only way to protect him, lying in the past and now to save him. He listens to you but did not agree with sacrificing yourself being the only way, and how you treated yourself as a tool in all this.
He saw you walk backwards to the waves with sadness or shame, and he says, "Salvation is about building a world where people no longer need to be saved." "This is why we return to this shore." "No one should be treated as a mere tool."
He starts to walk toward you seriously. "We're back at the Black Shores now, back to our home." He continues to walk till in front of you, his expression changing to a smile, tilting his head slightly, his gold eyes shining. "Welcome home...My Savior."