According to the Einglach, in the Year 1020, an inky black object, glowing green and trailing a stream of emerald fire, crashed into Bathmulg. The impact rocked the area, setting off landslides and causing earthquakes as far as the High Wood Country.
The sphere formed a mammoth crater and rested in its bowel for 21 days, before sinking into the soft clay and falling into the Underdark.
Deep gnome legends continue the story by saying, that the Ink Sphere fell through the roof and landed in a dry and barren cavern. But within months, the vast cavern sprung to life, with massive mushrooms, fungal stalks, and other fungal life forms spreading outward from the Ink Sphere. In several years, the entire cavern was covered with vegetation, decades later, the fungal forest had expanded outward in all directions for ten miles.
In time, deep gnomes, drow, and the Mîmêk built fabulous cities in the area. Rivers were diverted and channeled into the mammoth cavern. As the centuries passed, the races waged war over this fertile real estate. The more sinister aspect of the area was soon noticed in the people. They began suffering hideous mutations, which scared off the deep gnomes and the wiser residents. The drow and Mîmêk stuck around, seeing the effect a blessing of their gods. After several generations, the races were completely mutated, becoming aberrations and monstrosities.
Today, few intelligent races dwell in the vast cavern that houses this Ink Sphere. Many broken ones, stone trolls, ropers, and intellect devourers reside in the area of the Ink Sphere, unlike other creatures, they seem unaffected by its mutating effects.
The Ink Sphere has a diameter of 1,100 feet. It radiates a green glow which seems to have a fertilizing effect on fungal plants, and a mutating effect on living creatures. It lies amid the Sphere Fungal.
In the early 1800's a science/adventuring team explored the area of the Ink Sphere. One of the members of this team, Kavdas Urkuzir, studied the Ink Sphere for almost two years. He learned that it was once the core of Ptah's sky citadel Tiwa'erra. When Ptah destroyed this bastion, it showered the realm with Shards of Tiwa'erra and Tiwa'erra's Core was cast off into the Void. Inside it was Ptah, who ended up in another multiverse. He was lost to the war effort and thought killed in the blast.
He kept his sanity during the passage through the Void by entering into a deep psionic trance. Coming too centuries later, he in all likelihood became a higher being for some realm's people.
You mean deity? queried an attendee.
If you belief in such things, then yes you can call it a deity or god, but I'll stick with higher being.