Psychedelic Volcano and Dark Figured Humanoids

I was inspired by a sci--fi story about strange creatures of the night, that roam an island. Thus, I created them as very tall dark robed humanoids that live an underworld realm. They do rituals together, following a Buddhist kind of solitary existence, being one with Nature. No one dares to come near, as it's told they have supernatural powers. They can change matter, as shown here as they watch an unusual lava flow from a mountain, which they changed the flow to be like a "psychedelic" colours.