After being repeatedly defeated by V1, Gabriel turns on the Council, killing all of its members. Parallel to V1's plot, Gabriel comes into conflict with the Holy Council, the supreme council of angels who rule heaven. V1 also fights a multitude of bosses, including V2, which is a later created, alternate version of V1, and Gabriel (named for the Abrahamic archangel), a supreme angel sent to stop V1.

Along the way V1 encounters demons, undead creatures, rival machines also looking for blood, and angels. After the extinction of humanity, the player descends through the layers of Hell in order to harvest the blood of the various creatures living there. In Ultrakill, the player controls V1, a machine that uses blood as a fuel source. The game uses retro-style graphics and movement capabilities similar to those of 1990s first-person shooters such as Quake and Doom. It was released through Early Access on Steam for Microsoft Windows on September 3, 2020. Ultrakill (stylized in all caps as ULTRAKILL) is a first-person shooter platformer video game developed by Arsi 'Hakita' Patala and published by New Blood Interactive.

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