Aleen

A world with a desert-like surface, Aleen was unique in that it contained a series of complex caverns in its upper crust. These were considered to be part of a distinct subterranean biome with its own unique atmosphere. Formed by the growth of the native arbozoic trees, the caverns were built-up of tunnels carved by water, lava, and tectonic shearing. Fostering a separate climate, and an atmosphere that was toxic to the surface-dwelling Aleena, the planet's two sentient species consciously decided to recognize the divide between the two biomes and remained separated. Aleen's surface was dotted with the remnants of Aleena colossi, standing as relics of an ancient, technological society abandoned in favor of a simpler lifestyle.

The homeworld of both the Aleena and the Kindalo species, Aleen was a world of two distinct environments that had a shared yet separate history. The human-centric scholarship of the Galactic Empire knew that the Aleena, and possibly the Kindalo, were client species of the Rakatan Infinite Empire, though there was little evidence of any occupation. Establishing a strong culture and a fierce army, the Aleena built towering monoliths that were vital to the religious orders that formed on the planet in the earliest days of the Galactic Republic, and long before the galactic community had discovered the world. Undergoing an expansionist era, the Aleena settled other worlds and spread into the greater galaxy, yet many remained on Aleen.

Some years later, the Aleena came into conflict with the Kindalo that lived beneath the surface of the world, and the two cultures waged a terrible war that greatly damaged both societies through the use of technological weapons. When the casualties grew to threaten the existence of life on Aleen, a compact was formed that secured the notion that neither society would interfere with the other again. To this end, the Great Seal was forged to serve as a reminder of the compact, and was placed within a primary tunnel opening that allowed access to the Underworld, where the Kindalo resided.

While the Great Seal was more symbolic then any actual barrier to the Underworld, as multiple tunnels and caverns were spread throughout the upper crust of the planet, it was a revered site among the Aleena. Vowing to leave behind the society that caused the near apocalypse on Aleen, the Aleena entered an era of self-imposed seclusion and scaled back development considerably. Aleena families formed together into kinship clades known as tahikos. The individual settlements across the planet maintained contact with a planetary government that advised the King of Aleen, a ceremonial role usually held by distinguished priests.

Over the course of the millennia, Duros spacers eventually discovered Aleen and introduced the Jedi Order to the world. Establishing a chapter house over top of the Great Seal, the Jedi protected the world for a time, before abandoning their chapter house and allowing it to fall into disrepair.

In 230 BBY, Aleen was attacked by the Nihil as a distraction for the Jedi and Republic.

The Republic saw humanitarian operations on the world during the Clone Wars, when the Great Seal became dislodged and the two atmospheres began to intermix. As a result, groundquakes caused major disruption on the planet. During the relief effort, a mysterious being called Orphne and white living trees were recorded by Republic agents—particularly the droids C-3PO and R2-D2—although her nature remained ambiguous.

When the Galactic Empire came to power at the end of the war, the Empire established an observation post and listening station on Aleen's lone moon, Trohlu. The Stormtrooper Corps once carried out a mission on Aleen. General Sorin carried out weapons tests on Aleen.