Kastner

There is a planet called "Anteverse" in a distant galaxy, where there are dark clouds, barren land, no rivers, only rock formations. The atmosphere is yellow. There is an alien species called Kastner living in the rock formations. This is a colonial creature that thrives by colonizing other planets. They possess extremely advanced poison-making chemistry and hyperspace technology, and can bridge other planets with their own by establishing "wormholes" to penetrate and attack from within the enemy. They created a huge, poisonous biological weapon as an army to invade other planets. That day, the earth was targeted!