This research examines the understanding and usage of sulphur as it is represented in early Christian apocalyptic literature. Current research on Christian apocalyptic literature focuses on larger geological events and features such as earthquakes and floods, however sulphur is a prevalent geological feature within Christian apocalypses. This research engages with the study of primary sources from antiquity that display the perceptions of geological phenomena and sulphur during the period and with contemporary geological research in the region. Using geological and ancient understandings of the Mediterranean, this paper explores the usage of sulphur within the Apocalypse of John, also known as the Book of Revelation. Regarded in these texts as a symbol of death and impending disaster, sulphur is represented within the Book of Revelation as part of the lake of fire and sulphur. It is within this lake that Death, Hades, and Satan are cast away for eternity. In the ancient Mediterranean, sulphur acts as a symbol of God’s judgement, wrath, and even death itself. This research demonstrates early Christianity’s representation of sulphur as an apocalyptic element that portends everlasting damnation and death.