Chernoggar
Chernoggar is a Dominion within the Astral Sea of the World Axis cosmology of Dungeons & Dragons, which serves as the traditional home of the various Dawn War gods of war and battle. Originally the domain of the dead god Tuern, it was usurped by his murderous brother Achra, better known today as Bane - Achra didn't get long to enjoy his new holdings, however, as Gruumsh promptly decided that he wanted to take Achra's power for himself and smashed his Dominion of Nishrek into Chernoggar, binding the two realms together and beginning a war between the two deities and their faithful that has lasted every since.
In effect, Chernoggar is an homage to the 1st layer (and thus the most famous part of) Acheron, hosting as it does the eternal war between orcs and goblinoids. Chernoggar was the original homeland of the bladeling race, before they mostly abandoned it in anger at Bane's betrayal. Lesser gods known to serve as exarches of this realm include Maglubiyet under Bane, and Bahgtru, Luthic and Vaprak under Gruumsh.
The astral islands orbiting Chernoggar are known as the Shrapnels, and are little less violent than Chernoggar itself.
Chernoggar is fully detailed in the 4e splatbook "The Plane Above: Secrets of the Astral Sea".