I am in the midst of working on that in my Expedition to the Barrier Peaks adaptation: Expedition to the Barrier Peaks Dark Sun Adaptation Guthay is full of alien life-forms, most of which have only a primitive intelligence at best (such as the Silk Wyrm and Shambling Mound), with the exception of the benevolent Silthilar, who learned life-shaping from the Rhulisti. However, diseases have advanced on Guthay at an unprecedented rate. The natives are immune, but any visitors become subject to the Guthay Fungi, a plasmodial slime mold which causes the subject to rapidly mutate out of control and die from genetic degradation. Ral is a dessert world like Athas, but has a surprising amount of intelligent life, mostly insectinoid. This includes the Dromite, Tsochari, and Diopsid races. Dromites are naturally psionic, and possess a caste based system which is surprisingly equitable, as well as a biologically enforced democratic system in which two of their members are chosen as the Queen and Consort and produce all the eggs. Dromites have very little in the form of religion. Tsochari are a worm-like race which infests hosts. They have individual hive minds and telepathic abilities, and their culture is very stratified. Diopsids are barbaric creatures similar to Kreen in mindset but appearing more like beetles. They worship the spirit of the Great Mother (Athas, which their world orbits) believing (correctly) that all change originates from that world. They also worship the Green Sister (Guthay), the Red Sister (Ral), and the Dying Father (the sun). They are treated as druids. There are also monstrous lizard species such as the fabled Tarrasques (yes, multiple). Also, the Psurlons are native to that world, though most have left for the Astral Plane. They have knowledge of psionic secrets that would make the Mind Lords of Saragar green with envy. I have not delved into the cultures of those worlds with much depth, so any ideas are welcome. Also, this is all non-canon speculation, so different interpretations are welcome.
Also, there is a stat write-up of Myron in Legends of Athas if you wish to see it. It’s under the Champion of Rajaat heading. It has a few errors in it, specifically under the Genocidal Focus heading, so I would double check both the template that follows it and the canon information about Myron to make necessary corrections. I imagine Myron could have wandered into the Cerulean Storm after it’s formation, attempting to produce a Cerulean advanced being.
Also, the Kreen have made low orbit, using psitech from the Green Age. This consists of a guardian orb and an obsidian engine. The Guardian Orb is taken from Lask psions and used to power the engine and provide propulsion using telekinesis. The obsidian engine provides lift and produces an area of compressed air which is breathable in space. The Guardian can power it indefinitely because of it’s construct status. Lesser forms of these craft use giant Trin carcasses as hulls, and can only fly in atmosphere. These are used in the war against the Lask as transports. The craft that have made low orbit are actually partially life-shaped. The Zik-Chil use nature bending to change a giant Trin into a living transport, which provides recycled air for it’s passengers (who are kept in a separate gland). It also allows the ship to propel itself by normal means in atmosphere using wings. It’s brain is replaced with the guardian orb, which can control the creature’s limbs. These are experimental, and do not have a practical purpose yet.