This technique is used by Shion. She releases power through her Mystic Safety Bell, and completely transforms. This allows her to send a huge ray of light which can penetrate Mōryō's darkness and disintegrate physical things, even people (like you did with Yomi). In this form, she has the ability to, and attempted to, completely destroy Mōryō along with herself. She was pulled out by Naruto before she could do so.