Several years ago, director Guillermo del Toro was working on a Justice League Dark movie that would have been part of the DCEU. Unfortunately, even though they had a script, the project didn't move forward as del Toro left by October 2015 and Warner Bros. decided to cancel it altogether and not hire another director.
Speaking with Josh Horowitz in the Happy Sad Confused podcast, del Toro revealed the roster that he was planning for the Justice League Dark movie that he was working on. He said, "I took a little bit of the opening of the Alan Moore Constantine. And I took the dynamics between Abby [Arcane] and Swamp Thing, and I took the sort of revelatory moments when Deadman gets into a body, how he would experience the consciousness of that being. And one of my all time’s favorites is the demon Etrigan. I love that character. Zatanna is really, for me, another character that is really effortlessly powerful and interesting. Trying to mix that with Klarion the Witch Boy...I was a DC guy."
It is unfortunate that the project didn't move forward and it sounds like del Toro was really passionate about it. The roster that he was planning for the team was interesting as most of them are characters that fans would have loved to see on the big screen. We also know that del Toro is a talented director and would have crushed it if it ended up moving forward.
Even though del Toro's project didn't move forward, a new iteration of the live-action Justice League Dark project now spearheaded by J.J. Abrams' Bad Robot Productions is now in development where it is planned to be adapted for both film and television. But there's no doubt that fans would have loved to see del Toro's version come to life.
We shall just wait and see where the new iteration of the Justice League Dark project will go as there's still no latest development.