Project: Fear Toxin - Suicide Squad: Kill the Justice League

A highly controversial project created by Batman in the aftermath of the Nightfall Protocol, when the world thought he was dead, Project: Fear Toxin combined Scarecrow's signature toxin with his weapons and gadgets. 

He would use these against criminals, microdosing his opponents with the toxin and forcing them to perceive him as a Ghost and a Demon. 

Even after his return to public life, Batman continued to work on the project in secret, using it in conjunction with the Babel Protocol in the event of the League being compromised.