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Nightmare Tank

What I basically did, I changed some color values of the textures and made the tank look bit more evil and I also lowered pitch of all of his sound files just a notch to make him sound more demonic but not to make anything too overwhelming. The aim isn't to make any substancial changes, but to make him look and sound more evil.
I thought of adding custom music(s) as well but decided to leave it so that you can pick the tank music of your choice and taste yourself without conflicts.

Eventually I might do the other special infected as well.

P.S. the sacrifice tank in the video is older version.