Sheol was a historical planet in a part of Sith Space were the recently created Sith Empire led by Darth Sith descided after the Hundred-Year Darkness to fight a massive war that crippled the Jedi Order and First Sith Empire of the time, the extent of the damage left a Force Nexus that could be detected throughout the known Galaxy, bathing the entire of Sith Space and most of Outer Rim to Wild Space in Darkside Energy.