Hel's Causeway

A wicked sorcerer ruled over the Under Realm with an iron fist. He had an army of loyal minions who would do his bidding, no matter how evil or cruel it might be.
One day, the sorcerer discovered a mysterious magic map hidden deep within the Under Realm. This map could guide anyone to any location in the realm, no matter how hidden or obscure it might be. Even to other worlds.
This map fascinated the sorcerer and immediately set out to find it. He sent his minions on a quest to search every corner of the Under Realm, and after many long months, they finally found the map hidden in a dark and abandoned cave.
It overjoyed the sorcerer when he saw the map and immediately set out to use its power to conquer the Under Realm. He sent his minions on a series of treacherous missions, using the map to guide them through the darkest and most dangerous parts of the realm.
As the sorcerer's power grew, so too did the fear and desperation of the people of the Under Realm. They knew they had to find a way to stop the sorcerer and his evil minions, but they had no idea how to do it.
Finally, a brave hero stepped forward to challenge the sorcerer and his minions. She was a skilled warrior and a powerful magician, and she knew that she was the only one who could stop the sorcerer's reign of terror.
Using her cunning and her magic, the hero tracked down the sorcerer and his minions and confronted them in a final showdown. It was a fierce and brutal battle, but in the end, the hero emerged victorious.
The sorcerer and his minions were defeated, and the magic map was destroyed, ensuring that no one would ever be able to use it for evil again. The Under Realm, or at least this portion of it, was finally at peace, and the hero was hailed a savior.
And so, the story of the magic map and the evil sorcerer came to an end, leaving behind a legacy of bravery and hope for all those who lived in the Under Realm.

Hel created the Causeway within the the Cumorian Mountains to grant her followers quick travel across the Helcynngae Peninsula. It allows great numbers of people to pass completely hidden from mortal view and is a causeway that is above Hel's Under Realm.
The wood and stone that makeup the causeway are inbued with great strength via Felling Magic. The process is dangerous and powerful that involves harnessing the power of death and the underworld, combining it with life in most unnatural ways.
Touching the wooden plants with a bare part of skin inflicts would that never heal, drain one’s life force and permanently reducing one’s lifespan. Only those who care nothing for life use this magic, and even then caution is advisted. Felling Magic is associated the ancient dark forces that can have unintended consquences.
Hel uses Felling Magic freely because she so often demands sacrifices from her followers. Their life holds no meaning to her. She only concerns herself with the passage of souls into her inventory and away from the afterlife of other deities. Hel is not bound by the same emotions as mortals. She is not subject to love or hate, or any of life’s emotions and is not invested in the lives of mortals. But their death brings her greater power.

Geography

The most recent development of the causeway is that the dark elves have discovered the causeway and opened a portal to it. Their mages have studied how it works and have begun building their own connection to the use in their war against the wild elves, in a land far to the west of the Cumorian Mountains, The Green Realm.
The Wild Elves have quickly learned about the dark elf’s new portal and have been devising magic to contain it. A powerful mage was called upon to construct a powerful magical barrier around the causeway that connects to their lands, and has restrained its power, at least for now. No major test of their barrier has yet to occur and so its long term effect remains uncertain.
Across the human lands to the north, rumors of a strange underground causeway has been spreading, especially around Bard’s Gate, a city-state that owes it power to commerce and controlling its travel. Adventurers, merchants, kings, and warrior alike have thought about seeking its power and using it for their own advantage. The churches of the old deities caution seeking it out, saying that using it is to make a deal with evil. But in these uncertain times, people are less concerned about morality and more concerned with gaining more power.