Irath saw how empty and lonely the universe was, and therefore took a smaller amount of Light from each distant places and created a huge glowing orb called the Glux. She had created a separate place where only she had the power, called the Irath'las, the Realm of Light. And she made the Glux as a gateway, the Porthint’glux, to Irath'las
- a passage from the Book of Irath
Glux can be referred to three things: The sun itself, the gateway to Irath'las, and the process of going to the Irath'las. The Glux is a bight shining orb that gives light to Agia, which would otherwise be cloaked in darkness. Scholars believes it is an orb made by fire, though no mere mortal can know for certain, since staring directly at the Glux both normally and through a telescope results blindness. Irathian priests tries to explain the blindness is a punishment for staring and trying to understanding a celestial body that is not meant to be stared at nor understood in any other way than the Goddess tell us to. According to the book of Irath, the Glux was the very first thing @Irath created once she was made by the Light of the Universe, and even a thousand years after the Goddesses' death, Irathians still believe that the Porthint'glux is open for those who have died.
The Porthint'glux is often portrayed as a round gateway surrounded by fire that leads into the light of Irath'las. Scholars who voices their doubts of it being a gateway, are met with booming arguments from priests, such as "it only appears as an orb for the mortals eyes. Only the dead, the Goddesses and a few chosen, are able to see the gateway and enter." It is difficulty to study the Glux because of the church strangles every proof that the Book of Irath might not be true all the time.
As for the journey to the Porthint'Glux, it is believed that the soul travels by the Glux light to the Porthint'Glux, there are some priest who preaches the light acts as a bridge to the Porthint'glux. Those who dies during nighttime, cloudy days, or other explanations why the sun is not shining, gets a funeral pyre so their soul can still travel to the Porthint'glux with the smoke from the fire.
According to the Book of Irath, she placed a being called Gwaenslaucis, the First Light of the Guardian, to watch over the Porthint'glux while she was on her search for love in Agia, that ultimately lead to her death.