Beholder of the Abyss is a Manga/Manhwa/Manhua in (English/Raw) language, PSYCHOLOGICAL series, english chapters have been translated and you can read them here. You are reading Beholder of the Abyss chapters on www.mcreader.net, fastest updating comic site. The Summary is
A sinister ritual, a city hidden away by the gods, a truth buried in darkness; only a baby survived, and 15 years later, the revelation comes again. The next generation, their fates intertwined, set out on a journey to uncover the truth, and the beholder of the abyss perhaps never left.