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Irkalla is the Underworld for servants of the Primarchs. Ruled by Nergal from his throne deep under the Tower of Eternity, it is a realm of still peace. The only disturbances are Nergal's nightmares, oozing from the scars of his near-annihilation by the Great Adversary eons ago. These nightmares twist reality, producing abominations which attempt to corrupt and rot the Realm, and are locked in constant conflict with Nergal's vigilant guards.

Axis Mundi

The Axis Mundi linking Irkalla with the World is situated in a temple under the Valley of Kings in Egypt. After the Primarchs retreated to their Realms, The Watcher destroyed the Axis Mundi and buried the temple deep under the Valley, to make sure no one would find it.