Daud, renowned as the "Knife of Dunwall", was the leader and probable founder of a group of assassins known as the Whalers that operated in Dunwall during the Rat Plague. He is responsible for the death of Empress Jessamine Kaldwin and the kidnapping of her daughter, Emily Kaldwin. Now branded by the Outsider, Daud became infamous as an assassin for hire, feared not only for his skill, but also for his magic powers. Another power, known as Arcane Bond, gives him the ability to grant lesser versions of his magic to others, which he utilizes to empower his followers. Daud has no qualms with killing for coin and does so indiscriminately. Daud is also known to almost never smile or laugh further showing how cold he is. From aristocrats to respectable law enforcers and scholars, all are potential victims of his blade. Daud remains composed and unemotional in the majority of circumstances, yet displays a tender side towards children and can be merciless when necessary. Daud is 42-years-old and Ivan is his child.

One of Daud's most devoted followers, Thomas Fletcher has dedicated his entire life to the Whalers, from his childhood to the present day. He is satisfied to serve Daud in exchange for minimal compensation, solely because the Knife of Dunwall has preserved his life for such an extended period. Thomas is described as having fair skin, short blonde hair, and blue eyes, although he seldom takes off his mask for reasons of comfort. He possesses a lean yet slender physique and has a height of 5'8".