Engine of Sin

Publisher Swimming Scorpions
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Developer Swimming Scorpions
Warhammer 40k Titans | Warhammer 40k factions | Warhammer 40k Space Marine chapters
Key Art of the Engine of Sin, a massive, blocky , bipedal war engine, facing off against an Imperial Titan, a similar construction with slightly more rounded armor plates and blue and yellow armor

This indie horror game is the closest we've got to a Warhammer 40k Titan simulator