New Tartarus was a parish of Dis, formerly called Ditchwater Slums. It is also known as the Undead Parish. It is ruled by Duchess Charlotte, who transformed the parish after obtaining the essence of the light god Ramenos.

The parish was characterized as a refuge and home for undead of all kinds, and the deadly miasma that permeated the parish, excluding the living who did not have means of protecting themselves from it.

After Kuro unleashed the Genocide Essence on the undead, Charlotte and her minions were destroyed, effectively destroying New Tartarus. The remains of the parish became Stillwater.