The Cycle of Arawn

The book dedicated to Arawn. The cover is black leather with an image of Barden. It's 800 pages were written by several different people. The first half was assembled in 60 years and the second part is even older. There is even a tablet that is allegedly 9,000 years old.

Jack Hand
A prince from an unnamed kingdom, Jack Hand, a name not explained, was a powerful nethermancer that killed his brothers' wives to attempt to bring them back to life. when his crime was discovered, both of his index fingers were removed to represent the murdered women, and he was locked away in the lowest cell block where he was fed once a day and tormented by rats and lice. This was to be his punishment until his eldest brother's hourglass ran dry which was supposedly supplied by the endless Mandal Desert.

In his dark cell, Jack Hand continued to hone his magic.

After three years, thanks to a rancid smell, the cell door was opened and a swarm of 72 skeletal rats emerged killing everyone so Jack Hand could take the keep's throne.

Under his rule, the kingdom expands massively.

Several years later, Jack Hand catches wind of a possible rebellion forming and sends his skeleton rat army to assassinate all he believed part of it.

He was said to have lived 180 years, fathered 12 sons, and just before his death, he was taken to the right wrist of Arawn's constellation.

The story of Jack Hand is where Dante gets the inspiration to save Blays in Whetten during The White Tree.

Stathus the Wise
He fought 6 armed men alone by creating a dark sphere around all of them. He was able to kill 5 of the 6 before he had to drop the sphere. Though it is not stated, the dark sphere was created with nether.

This is the same technique Dante uses sub-consciously when he and Blays are attacked in Bressel and his first time using nether.

Kennen
A student of Stathus the Wise, everyone thought he was a shoe in to replace his teacher. Yet when the time came, fellow student Vanya took his place. Enraged by this, Kennen delved deeper and deeper into the nether. He was eventually able to create a shadowy shaped man that could tell your enemies' secrits at an unnamed price, it is assumed to be hefty. Vanya was able to banish the creature with a massive amount of light, most likely ether.

It is unclear if the story is about an Andrac or simply something similar.