Awakening of Supernatural Powers: I Am the Emperor in the World of Mountains and Seas

In an urban world parallel to the real world, the residents of this world awaken a special ability called "Mountain and Sea Power" when they reach adulthood. These abilities are derived from the mythical creatures and rare treasures in the ancient "Book of Mountains and Seas". The abilities awakened by each person are related to the content in the "Book of Mountains and Seas" and have unique shapes and abilities.