Dalhéjons

Dalhéjons are a fictional species featured in the popular science fiction novel "The Expanse" by James S. A. Corey. They are an intelligent, bipedal, and amphibious alien race native to the planet Ilus. Dalhéjons are characterized by their sleek, dark blue skin, large, bioluminescent eyes, and webbed hands and feet, adaptations for their aquatic homeworld. They possess a complex respiratory system allowing them to breathe both air and water.

The Dalhéjons are a technologically advanced civilization, though their societal structure and motivations are initially mysterious to humans. They are known for their intricate artwork, particularly in sculpted crystalline materials, and a profound connection to their planet's ecosystem. Their presence on Ilus, which humans rename "New Terra" after colonization, leads to significant conflict and misunderstanding. The Dalhéjons view the human arrival as an invasion and a desecration of their ancestral home. Their primary defense mechanism involves manipulating the planet's magnetic field, creating environmental hazards for the human settlers. The narrative explores the difficulties of interspecies communication and the ethical implications of colonization, with the Dalhéjons serving as a crucial element in this thematic exploration. Their origins and the full extent of their civilization remain a subject of ongoing discovery within the series.