It served as the resting place for the Castle of Lions, sheltering Allura, Coran, and the Black Lion for around 10,000 years. The Castleship and its occupants were awakened once Lance, Shiro, Keith, Hunk, and Pidge arrive in the Blue Lion. The local Arusians soon send Klaizap to investigate the Castle after witnessing Voltron battle Sendak's warship.
Arus is a hospitable planet with an abundance of water, green plant life, and a breathable atmosphere. The Castle of Lions is located atop a rocky bluff by the coast, surrounded by deciduous forests and grassy hills. There is a variety of local plants safe for human consumption and an apparent lack of deadly flora or fauna. Hunk was even able to concoct several edible meals from species growing in the nearby woods. Arus' moon is either far larger, or in closer proximity to the planet, then Earth's moon is.
Arus is located in the Javeeno Star System; so distant, that it contains constellations unfamiliar to humans and even sits on the fringes of the Galra Empire. It has a nearby asteroid belt called the Zolar asteroid belt.
- For more information, see the Arusians article.
Arusians are small, bipedal aliens with two curved, brown horns and thick prehensile Tails. They appear Furness, tend to be pale in colour and decorate themselves with clothing and ornamentation scrounged from the nearby woods. The local population live in a village near what they call "Gabriel Hill".
The Arusian culture appears to be a feudal one with primitive hunter-gatherer technology. They have a basic political structure - Monarchy - and small organized military. The warriors who belong to the military take great pride in their status and fearlessly challenge their opponents to win honour for their family.
Arusian residences are square clay or plaster huts with thatched roofs. They have basic aquastructures like wells, but no long-term food or water storage facilities. Daily life revolves around gatehring food, farming, and religious worship. They have a practice of performing ritual sacrifices for higher beings they perceive as gods: one Arusian was almost burnt alive in honour of the Paladins arrival on Arus.
- Arus is the first known alien planet visited by the humans of Team Voltron.