The World Beneath
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The Underdark is commonly thought to be underneath the material plane, however no matter how deep you dig you'll never reach the Underdark. While the barrier between the Underdark and the material plane is very thin, often entrances appear to be normal caves, ravines, or sinkholes. In rare cases where the barrier is especially thin if travelling underground and you trip or fall you may end up in the Underdark.
as the years have gone on the entrances to the Underdark have been sealed off and now only a few well known ones remain. Though these paths through the barrier were never removed, simply blocked rather rudimentary with magical seals or large amounts of rock and dirt. though even before then when the Jotunbrud walked freely it was the great Stein-Jotun or Stone Giants in common, the oldest of the Jotunbrud who where the gate guardians between the mortal realm and the Underdark.
In those early years the paths to the Underdark were grand but few in number. The Stone Giants crafted massive gates unlike any seen today that only open to a Giant's essence. but since then the paths have become smaller and numerous and closer. Though the old Gates still hold power and are a sight to behold.

The Underdark is an infinitely sprawling connection of tunnels and caves, underground seas, lakes, and rivers can also be found. There have been attempts at mapping the plane but have proven fruitless due to the complexity of locales. Most parts are shrouded in complete darkness while other areas are lit in dim light by glowing fungus or by the settlements and towns that are scattered few and far between.

Many races have made their home in the Underdark such as Derro, Drow¹⁾ what's left of the Duergar²⁾, and Illithids.³⁾ There are also many monstrous creatures such as Aboleths, Beholders, Cloakers, Kuo-Toa, and Driders.

• UNDERDARK REGION
• Shadow Realm Shadow-Fell Far-Realm

Homes, Towns or other like locations that have not been pinpointed in a specific part of the map yet.

Drow city of Ridorana
The major city and birthplace for most Drow living today, The city is enormous bigger than most on the surface. Buildings are not only built but carved into the surrounding cave walls and even buildings built off the rocking ceiling and gigantic stalagmites'.

It is one of three Drow Cities known of in the Underdark and its where the Spider Queen Lolth resides.

Duergar city of Nabundis
A crumbling city fallen to ruins. a combination of several things including infertility and poor leadership leave the species of Dwarves known as Druegar all but extinct. its theorised that the species will completely die out in the next few hundred years. only their long life spans keeping them around that long.

Lair of Lord Brigznier, Black Gulch

Myconid Forests
The main population of the species known as Myconoids. otherwise peaceful and neutral people that are far from most other dedeziens of the Underdark. Mostly unbothered by all other parties.
An entrance/exit to Vylanna Forest lies here.

John Drow

Currently not in time Line order

Oxtrad , Underdark War
The war between Oxtrad and the Drow of the Underdark, after many decades of increasingly aggressive Raids by Drow on Oxtrad land the ruler declareed war and their aoldiers marched into the Underdark where they battled and slaughtered the Drow, the casualties were massive on the Drow side and that moment put an end to the Drow raids for many years.

The Stone Gate Sealing
Long before the Underdark was deemed to great a threat to be left so freely connected to the material Plane so the Stone giants crafted great stone gate seals to seperate the two realms

Drow Culture Re-Taught
In the last few decades the Drow people have started to re-learn Their own culture. It has been slow Going and not without friction but its progress

Drudgar Freedom War
The Druagar (Grey Dwarves) mount a revolution against thier Ilithid slavers, driving them deeper into the Underdaek. Though the victory was sweet the Druagar would slowly die off due to leadership and infertility issues.

Lord Brigznier’s Settelemnt
An ancient Copper dragon makes its lair in the underdark and becomes a part of both the ecosystem and merchant trade

Narkul’s Banishment
The Lich Narkul is banished to the Far-Realm. ‘bellow’ the underdark.

The Shadow Realm, also known as the Far Realm, is a place deep within the already deep depths of the Underdark. This maddening realm is feared for its power to twist unfortunate visitors into gruesome monsters, and it was from here that aberrations came, slowly reaching into the Underdark proper and even breaching into Felwind.
Not even Oxtrad's war on the Underdark went as deep as Shadow Realm.

Narkul was banished to this realm when he posed a threat to Mor-Thir.