User blog comment:The Crimson Eagle/Batman: Arkham Asylum alternate endings/@comment-5557876-20120819023628

If you want to know what we think they used it for, this is what I got:

Scarecrow: To enhance his Fear Gas in some way to make it stronger...don't ask me how, Crane is the Doctor. My idea for an Arkham City sequel has Scarecrow as the main antagonist and I said he enhanced his Fear Gas, probably with Titan.