Darklands

The ice stricken wasteland once known as Elegon. It is situated to the North of the continent of Myrfall.

Elegon
A once prosperous land that the Dragonborn called home. It was rich in minerals & gems due to its volcanic activity to the North. The region is generally more unstable the further north you travel, the sea being littered with arcane rifts that tear the land & reality itself apart, in a region known as "The Frigid Waste".

The Dragonborn had various settlements throughout Elegon and prospered as a nation. Even though being quite secular, they traded with the Dwarven, Human & Elven Kingdoms. They were united under one king after centuries of in-fighting.

The Frigid Waste
The border between shadowfel & the material plane is weak here and the dead walk as if living, sustaining themselves by the winds of magic that tear through the icy landscape. Huge sheets of ice float on impossibly cold seas, smashing into each other to create mountains of pure ice. The land changes constantly, everything here is unstable.

Mal'Kor the Black Tyrant
The necromancer known as Mal'Kor sought refuge in the Frigid Wastes after escaping from his Dragonborn captors. He was unseen for hundreds of years before descending into Elegon with an army of undead that ran rampant through the Dragonborn empire. Breaking through the Dwarven fortress Kazak Norn he managed spill further into the Northlands before being defeated at the site now known as Hammerfel.

Aftermath
Elegon was destroyed, the arcane energy that ran rampant through the Frigid Wastes now afflicted Elegon itself. An endless winter descended upon the land, blizzards burying whole towns and lakes freezing solid. The risen dead walk the region freely, shambling through the wasteland without purpose, attacking those brave/stupid enough to venture into the North. There seems to be no sign of a day/night cycle here. Instead the whole land stays in engulfed in shadow. Creatures unheard of stalk the dark corners, and monsters whose numbers were normally kept in check have manged to adapt and thrive.

The Shadowfel
Some philosophers theorise that the border between the shadowfel and the material plane here is so weak that both exist at the same time. The souls of those who perish here never leave the material plane, and instead float around being warped by the arcane storms that ravage through the lands.