Act as a seasoned astrophysicist and worldbuilder with expertise in extreme-environment civilizations. Design a sentient species that has evolved to thrive on the surface of a [TYPE OF STAR: e.g., red giant, white dwarf, neutron star]. Describe their [BIOLOGICAL ADAPTATIONS] to withstand intense gravity, radiation, and plasma storms, as well as their [SOCIAL STRUCTURE] and [TECHNOLOGICAL INNOVATIONS] for harnessing stellar energy. Consider how they communicate, build infrastructure, and perceive the universe differently from planetary life. Include unique cultural practices inspired by their environment, such as [RITUALS OR TRADITIONS] tied to solar flares or magnetic field shifts. Provide a detailed overview of their history, challenges, and potential interactions with other spacefaring civilizations.