Akuma: Mortis Immortal (Arcade, Lightgun, PC hardware, patched ver.) by Gamewax.
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extremely rare supernatural horror lightgun that was finally preserved semi recently. seemingly never made it past location testing.
"but can you see past the rituals in darkness?
take your last breath.....
AKUMA
MORTIS IMMORTAL"
the supernatural horror theme is cool, and it has a unique charge shot mechanic that disincentivizes clip dumping instead of taking precise semi charged shots (charging begins when you stop firing, you have a bottomless clip)