Games Workshop revealed Nightmare, a new boxed set for Warhammer 40,000: Kill Team, at the Las Vegas Open 2024.  The Las Vegas Open 2024 kicked off at the Rio hotel and casino on January 18, 2024.

The new boxed set pits two of the most terrifying armies in the galaxy against each other: the Nemesis Claw warband of the Night Lords and a new coven of Drukhari Mandrakes.  The Night Lords sport new weaponry, such as a chainglaive, barbed talons, and toxin-laced knives.  The Mandrakes' forces come with the Mandrake Shadeweaver, a unit that can cloak the battlefield in darkness.  This boxed set features these two complete Kill Teams and terrain pieces plus 9 new missions for players to battle their way through.

Games Workshop also recently released Salvation, another new Warhammer 40,000: Kill Team boxed set (see "New 'Warhammer 40,000: Kill Team'").