Abeir

Abeir was the twin planet of Toril, located in the same material plane of its sibling world, but within a "pocket dimension" that was out of synchrony with Toril. Abeir revolved around the same sun of Realmspace, although from Abeir the sun was seen as blue colored. Abeir shared the lunar satellite Selûne and its Tears with Toril.
Abeir had steel-colored sky due to the arambar, the residual energy left by the death of the primordial of the same name.  The only known continents of Abeir were Shyr and Laerakond (at least before it was transferred to Toril). For a time, Maztica was also part of this world. Like Toril, it also contained an Underdark. The original kingdom of the Abolethic Sovereignty was also located on Abeir.
After Ao sundered the world of Abeir-Toril, splitting it into the two twin planets, Abeir and Toril, he gave Abeir to the few primordials who survived the Dawn War to rule. Those primordials were tired of war and were unable to overcome their dragon steeds when those rebelled against them, starting the conflict known as the War of Fang and Talon. After the war the few primordials who survived retreated into hiding and fell silent, and only a handful of dragon lords survived. Not long after, a mighty dragon called Gorloun founded the first dragon empire, and soon rival draconic realms sprang up thereafter, and the long Rule of Dragons began. In the lands of the eastern continent Shyr, the despotic primordial Karshimis also created his own nation. These nations quarreled each other for ages, but draconic rule remained nearly unchallenged until the Blue Breath of Change, when both worlds merged for a certain time. Laerakond and other regions of Abeir were transported to Toril, and the fate of the remaining nations on the world of Abeir became a mystery to Faerûnian sages

Type

Planet