Now with Jace confined to the Malakai Configuration, the group has the time and means to work on a cure to free him from Lilith's control. They want their brother/friend/boyfriend back from his evil state. However, they're going to need the right spell or potion to break the curse.
Based on the preview photos below, the group is confronting their demon head on.
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Simon, Alec, Magnus, Isabelle and Luke are taking the fight to Jace to try and break through the mind control. From what we saw during Shadowhunters Season 3 Episode 7, Lilith's hold on his mind was strong. Talkingt to him may not work, but could