The Scarred Nebula, Purgatory.
For the aborigines of this planet, the land they stood on and the sky above them have an immense meaning to them. The legends of the heavens and earth had passed on for ages, and these legends were intertwined with reality. In addition, very few mortal races had gone through what they did. The land that they stood on was the corpse of a planet-size superorganism, and the skies above their heads were covered by the leaves of these superorganisms. They had gone through living beneath the planet's crust, and have seen the crust cut open by powerful mining starship, opening up foreign stars to the aborigines...
Then came the Yggdrasil's dimensional chain that connected the star system together, and the glowing nebula vortex said to be connected to another universe...