Arvaillun

Arvaillun is a fictional planet located in the Andromeda Galaxy, approximately 2.537 million light-years from Earth. It is the third planet orbiting a G-type main-sequence star known as Veridian. The planet's surface is characterized by vast, crystalline plains and towering, luminescent flora. Arvaillun has a thin atmosphere composed primarily of nitrogen and argon, with trace amounts of an unknown gas that gives the sky a perpetual violet hue.

The dominant intelligent species on Arvaillun are the Lumina, sentient beings composed of pure energy. They communicate through complex light patterns and psychic emanations. The Lumina have no physical form as understood by terrestrial biology, subsisting on ambient stellar radiation. Their society is deeply philosophical and focused on understanding the fundamental nature of the universe. They have developed advanced technologies based on energy manipulation and consciousness projection, allowing them to traverse interstellar distances without physical vessels.

Arvaillun's geology is rich in exotic crystalline structures that resonate with the Lumina's energy forms. These crystals are integral to their technology and their way of life. The planet experiences a unique diurnal cycle, with Veridian emitting fluctuating energy pulses that cause the crystalline plains to glow at different intensities. This creates a mesmerizing, ever-changing landscape. The Lumina are believed to be one of the oldest known intelligent species in the Andromeda Galaxy, with a civilization spanning eons. Their interactions with other species are rare, primarily occurring through indirect observation and energy signature analysis.