Malumbris

Malumbris was a former plane created by Vorokar during the First Era, intended as a home for both the Elder God and his fiend minions. Malumbris was infinite, and was a realm of darkness and debauchery, where all kinds of evil flourished.

From this plane, the fiendish forces began the war with Talus, Vikyn, and the celestials, and sought to corrupt all of creation. The fighting here was so intense that part of the plane was torn apart and splintered off, creating Gehenna, the home of the Yugoloths.

At some point, Vikyn, along with Michael, Azrael, and Eris, managed to trick Vorokar's Generals on Malumbris into turning on each other, kicking off the Blood War.

The immense death and destruction of the Blood War split Malumbris into the two planes now known as the Hells and the Abyss.

When Neket sealed the Elder Gods away, he placed Vorokar in New Malumbris, which is said to be a faithful recreation of Malumbris in its original form.