Yiguandao is one of the Chinese “syncretic sects” active mainly in Taiwan and among the Chinese diaspora in Asia. It was formed in Mainland China in the first years of the Republic, but was banned from the PRC in the early 1950s. It claims to contain and surpass teachings of all other religions as it is supposed to possess and teach the entirety of the Dao. Its central deity, the Unborn Mother (Wusheng Laomu), who resides in the Heaven of Principle, is the personification of the Dao itself and the source of the teaching brought to people by powerful Buddhas reigning over three periods of time. We are now living in the final period called the White Yang and the entirety of the teaching was brought to the world by Maitreia, and two other Buddhas who appeared in the world as the last “patriarchs” (or in fact the founders) of the Yiguandao. This teaching (the Dao) has to be spread among the people so they can be saved from the final apocalypse which will end this universe. The saved souls will return to the Heaven of Principle and reunite with the Unborn Mother. This article brings the outline of the cosmology and eschatology of the Yiguandao as based on some of the sect’s scriptures and it describes its symbols as well as terminology.