Infernal Technology and Terminal Reality have filed a lawsuit against Microsoft.

That's according to Patent Arcade, which reports that Terminal Reality, the developer of BloodRayne, has alleged that Microsoft games including those from the Halo, Crackdown, Forza and Gears of War franchises, as well as recent releases like Playerunknown's Battlegrounds and Sea of Thieves are infringing on patents that the studio owns from its Internal Engine graphics tech.

Specifically, these relate to lighting and shadow methodologies using in graphics tech.

Terminal Reality was founded in 1994 and was best known for titles including BloodRayne, Nocturne, Kinect Star Wars and The Walking Dead: Survival Instinct.

The studio closed down and liquidated its office in Dallas, Texas, but it would seem that the studio has lived on through its technology. The firm created a great deal of tech for its games, including the Infernal Engine. Terminal Reality opted to license that tech out in 2009.