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Stars of Blood

Stars of Blood was a game developed by Valve Software. Rumours of a new game called Stars of Barathrum surfaced in 2012 and in November 2012 Gabe Newell confirmed that a game called Stars of Blood had been in development and that it was a space pirate themed game that "never saw the light of day"(https://www.engadget.com/2012-11-12-valve-had-a-space-pirate-game-called-stars-of-blood.html). It is not clear when development started or finished though based on Gabe Newell's comments, it had likely been cancelled for some time.

Although Stars of Blood was never released, a few pieces of concept art surfaced in 2021. Further concept art surfaced in June 2023 showing characters by Peter König and as well as scenery concept art. Curiously, one of the pieces of concept art appears to show Combine dropships from Half-Life 2.