It's not really a post credits scene but a post credits sound and that is the Riddler teasing us with more mystery as to who Hush was leading into Lex Luthor was pulling the strings and he has some other files on all of the Justice League's members
Here are all the files Luthor has thanks to this guy
Slade Wilson/Deathstroke
Mark Mardon/Weather Wizard
Barbara Minnerva/Cheetah
Sinestro
Dr. Sivanna
We also hear Luthor on the phone with Riddler.Luthor mentions he wants to meet with another villain to potentially be in the Legion of Doom
I'm using this stinger to establish whose in the Legion of Doom because it has to be established at some point paralleling how the Justice League got together.
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