It is the site of a man named Samiuela Taufa in Tonga. Don't call them myths. Myths aren't true. History and legends.
Legends are history that happened a long time ago.
A mokorea is an evil spirit from Te Po, the night world. The night world itself is not evil. It is really like heaven, but there are evil spirits on the path to Te Po. Then there are tuputupua. These are spirits and they are often ancestral spirits.