Asog used to be a thriving planet suitable for life. However, before the Jedi text, Rammahgon, was written, about five millennia prior to the Yavin Battle, followers of the Sith way of using the Force turned Asog into a wasteland; this event was later recorded by the Jedi Master Kli the Elder within a section of the Rammahgon.
The initial reference to Asog occurred in Michael Kogge's junior novelization from 2020 of the 2019 sequel trilogy movie, Star Wars: Episode IX The Rise of Skywalker.