Papa Nihil, or Papa Emeritus Zero, sometimes also referred to as "Sax God XD", first appeared at a Ritual on September 30, 2017, after the final performance of Papa Emeritus III was abruptly ended. At this Ritual, Papa Nihil announced that the "middle age" has begun.

It was revealed in Chapter One that Papa Nihil is the father of Papa Emeritus I, Papa Emeritus II, and Papa Emeritus III.

Papa Nihil toured with Ghost during their Rats! On The Road tour in 2018 and was featured on the saxophone for the track "Miasma" off of Prequelle.

It is speculated that Cardinal Copia may be the love child of Papa Nihil and Sister Imperator, with strong evidence from lyrics of previous tracks, such as Prime Mover.

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