Acherus: The Ebon Hold (also called Ebon Hold or Acherus) is the starting area for all death knights of both the Alliance and the Horde. It is considered a sanctuary, so no PvP combat is permitted inside.
The Ebon Hold is a Scourge necropolis floating above the town of New Avalon in a region called the Scarlet Enclave, east of Tyr's Hand in the Eastern Plaguelands. Death knights — starting out in the service of the Scourge — are tasked with killing Scarlet Crusaders who reside in the town below, and other assorted tasks to learn their class and use their powers. It is originally a stronghold of the Lich King, but after the Battle for Light's Hope Chapel, it becomes the base for the Knights of the Ebon Blade.
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Acheron, meaning "river of woe", is a river that runs in northwestern Greece, and is connected to various underworld mythos. In Greek mythology, the river Acheron was a branch of the river Styx; Acheron was the border to Hades, and those seeking to enter Hades had to pay Charon, the ferryman, for passage. Those who could not were condemned to wander the banks of the Acheron for one hundred years.
In his epic Aeneid, the Roman poet Virgil uses "Acheron" to refer to all of Hades, and says the following to the main character, Aeneas: "Flectere si nequeo superos, Acheronta movebo" ("If I cannot deflect the will of Heaven, I shall move Hell").
Acheron was also described as the river that formed the border of Hell. In the Inferno, book one of his Divine Comedy, Dante Aligheri - given a guided tour of Hell by Virgil - meets Charon at the banks of the Acheron and pays for passage across (at Virgil's insistence and despite Charon's reservations, as Dante was still a living man during his journey through Hell).