The classification of ancient metaphysics was more complicated. Different mysticians might have different methods and standards for classification. The following are some terms and concepts that might be considered to be of a higher level in metaphysics: 1. Mystical Spirit: Mystical Spirit is a basic concept in metaphysics. It is considered to be an existence that surpasses humans and can be considered the origin and foundation of all things. Mythical spirits were usually considered to be entities in a high-dimensional space with powerful energy and strength. Mystic Immortal: Mystic Immortal is another basic concept in metaphysics. It is considered to be an existence that is higher than immortals and can usually master supernatural powers and skills. Mystic Immortals were usually regarded as entities in a high-dimensional space whose strength and skills often surpassed human understanding and ability. Mystic Emperor: Mystic Emperor is a myth in metaphysics. It is believed that an emperor who lives in the heavens has extraordinary power and ability. The Mystic Thearch was usually regarded as an entity in a high-dimensional space. Its strength and skills were usually beyond human imagination. 4. Dark Yin: Dark Yin is a concept in metaphysics. It is considered an evil existence and is usually seen as the terminator and destroyer of all things. The Dark Yin was usually thought of as a low-dimensional entity with terrifying power and skills. It should be noted that these concepts and terms may differ in different metaphysics and literature, so the specific grading standards may also differ.