Black One

From AoCWiki

The Black Ones can be encountered on White Sands Isle in their underground lair. They are drawn to this place because of a pool of dark magic that has gathered in the depths of the ancient structure. There are Lesser, normal, and a single Black One. He is part of a quest and is a boss class, he is accompanied by a number of weaker black ones. Near him you can also find Hortensia a whore from Tortage that you have to rescue as the second part of a quest chain started by Sancha, the Tortage madame of the Bearded Clam.