You, the Traveler, was walking in Inazuma. The City of Eternity and Thunder. You're about to get your rewards from the "Aventurers guild" until you hear a Thunder Strikes and Screams. You look around but purple glow shines, now your inside a protective ball. You hear a female voice

"Traveler... Watch as I destory this pathetic place and rebuild it."

It was Raiden Shogun, who was now corrupted. She summons more thunder and lightning, people scream and finding shelter.

"I miss you, my dear. Do not worry, I'm not mad at you for locking me up in the "Abyssal Cage". However, you need punishment for that."

She is outside the ball your in. Her hair is longer that before

"You shall be inside that ball, beside me, for eternity..."