Into the Void (2020)

From publisher blurb:

AN ADVENTURE by Walter Srebalus
FOR Odysseys & Overlords
SUITABLE FOR 4-6 CHARACTERS OF 5TH – 8TH LEVEL

The Void existed long before any of the gods created the mortal world, filling the space between and touching all the other planes of existence. Made up of mysterious dark energy, it contains secrets of unknown powers and harbors unimaginable creatures. Few have been known to tap into the Void as doing so usually ends in corruption of the mind and body beyond recognition.

Years prior to the Schism in the Territory of Shaymar, an archmage and his apprentice residing in the city of Rulix, prepared to decode their newfound text. After months of preparation, the archmage attempted to access the Void with terrible consequences. An uncontrollable darkness was summoned and the archmage’s body was consumed within it.

The baroness ordered the collapse of portions of the underground catacombs to protect the city from the dangers created by the archmage. While the danger of the portal remained buried under the city, a new threat commenced with the Gods engaging in war.

Over the years, portions of the ruins of Rulix have had many occupants and recently a section has been claimed by a clan of scavenging kobolds. These scavengers began digging under the ruins looking for vaults or treasures lost in the Schism. After months of digging and successfully finding pockets of wealth, they discovered a new horror of unspeakable nature. The kobolds, shaken by their discovery, fled the area. Tales have started to circulate that a dreadful darkness lurks under the ruins of Rulix with a large horde of treasure still waiting to be claimed.