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Tartaros Veil

In a simulation created by the Isu Aletheia, a Tartaros Veil or a Tartaros Rift is a gate in the realm of the Underworld which keeps all living souls from crossing the gateway between Tartaros and the rest of the underworld.
During the Peloponnesian War, the misthios Kassandra explored these veils scattered throughout the Underworld.[1]
Powers and capabilities
The veil appeared as white concentration of air pocket, similar to fog, and roughly forming a shape of wall covering an entrance and constantly emitting flow particles.
The veil barred entrance into what is behind it from all life. The only way to traverse them is by fully wearing the Armor of the Fallen crafted by the Isu, and when one does so, the veil is no more than an air.