Scarecrow- Ivy Resistance

  “Why are you, in all of Gotham City, immune to my fear toxins?” Scarecrow’s voice continued to drone inside of his cowl, still complaining to his unknown companion. “What is your secret? Tell me now.”
...

  “Do you want me to dissect you? Do you want me to make your death, and the deaths of your loved ones, painful? You know you can relieve them of their agony. Tell me how you resist my power. Tell me now!”
...

  Through his comm Batman heard another voice. A woman’s, and instantly he knew.

  “My plants are eternal, Scarecrow. Nature has been with us from the very beginning, and will outlast us all. There is no poison made by man that she cannot resist, and then provide to me, her very own beloved daughter.”

  Poison Ivy. Scarecrow was trying to intimidate Poison Ivy.

- Batman: Arkham Knight, chapter 6