"Dark" was a fairly recent DC title that grouped together heroes such as John Constantine (who was the title character of a solo 2005 movie that starred Keanu Reeves), Deadman, Shade the Changing Man, Zatanna and Swamp Thing (who had his own Wes Craven-directed pic in 1982), among others.
The project was in development for several years as a directing vehicle for Guillermo del Toro, but things didn't work out, according to The Hollywood Reporter.
Liman, 51, is known for his kinetic and propulsive action movie sensibilities, thanks to such hits as "The Bourne Identity" and "Mr and Mrs Smith".
Michael Gilio is writing the script for "Justice League Dark". Scott Rudin is a producer on the project.