The History of the Aeon Universe: the Six Drives
The cerebrus drive is said to only be bestowed to one who is given the title of "gatekeeper of the underworld" and is said to triple the output power of any art for no extra mana consumption.
Stopping Dragonien
He sighed, stood up, and created a portal that would take him from his underworldly lair to the surface, where he could handle this situation personally.
Heracles and the (Horny) Hellhound Part III
I managed to suppress a chuckle, leading my 'kidnap victim' through the stronghold and into the main palace, now seeming pitiful compared to the vast complexity that uncle hades possessed in the underworld.
AZ-04 Hazardous Panic
"i know because mind reading or esp and telepathy are underworld abilities. only an underworld divinity can teach you those skills.
Identity: Chapter Seventeen
They 'own' a slug of businesses, in chinatown and the underworld and elsewhere. people who they force to pay them in trade for 'protection,' you know the line.
Chapter One: Getting Back in My Element
Ever since the defeat of the lord of the underworld, the people of that first town couldn't have been more happy.
[COMMISSION FOR ydnkm] Succubus Rising
The underworld does have strict rules about which upperworlds we're allowed in and at what times. with rules like that, there isn't exactly an endless supply of prey.
Pinned and Bred by Her Brother: Against a Lioness' Will (erotic eBook teaser)
She cannot stand up to him, her life changed, dragged down into the underworld to be his broken plaything...
Sacrificed
Another week later, the twisted dragon had returned to his chamber which was situated between an exit to the overworld and the entrance to the underworld. he smiled sitting as he watched the sun set though the exit of the caverns.
Khaliset's Creation
The story begins with anubis, god of the duat, lord of the underworld. him and his wife, anput, had one daughter together named kebechet. the couple agreed they wanted a second child, but one that could walk freely in the land of mortals.
Spirit Bound Chapter 162
"_ _"sorry, but_ i _am the shepherd of souls, and none can take you from me, nor can anyone take you out from the underworld without hades' consent; he alone holds the keys."
Resonance Universe (V2) - United States map
While modern and contemporary, the resonance universe is a setting where politics, the criminal underworld and espionage are visible only through a lens of white-and-grey-and-black morality.