Dissumusk - The Pale Death

Background
Dissumusk was an albino Mind Flayer; nicknamed the Pale Death, both due to the colour of his skin and the terrible things he could do to people. He was a collector of many rare and powerful items, having them guarded by Orcs and even darker beasts, in his home just outside of Skullport.

At some point, he came into contact with the slave Cainon Hallowell, making a deal for the former wizards freedom back into the world. It was unknown what he got for his end of the deal.

At some point, he made an enemy out of Xanathar, the two being rivals.

Interactions with Mystic Obscura
Dissumusk found Mystic Obscura within his home, enraged that they had killed his friends. He and his guards readied to kill them, but eventually a deal was made after Dissumusk revealed to Adrie he had the Gem she searched for around his neck.

Lady Eloithe would visit him once per week every time she was in Waterdeep, until the time the Vampire who made his friends vampires was delivered to him for punishment. In return, he gave the group the amulet and a teleportation device for Lady Eloithe to reach him each week she was in Waterdeep.

They parted ways, with Dissumusk warning the others never to return. Only Eloithe. Eloithe returned upon realizing that the vampire Dissumusk spoke of was her sister. Dissumusk gave her two years to return, or he would eat her family for her failure. She agreed to return in time.

Dissumusk grew bored of waiting for Eloithe, kidnapping her brother and friend Emmalee, and held them hostage, as a lure for Mystic Obscura to find him. Fighting bravely, the group fought with the Mind Flayer, with Arannis eventually killing him, but not before Aegon was slaughtered by Dissumusk, the Mind Flayer dying with a taste of Half Orc in his mouth.