Shadowhunters: The Mortal Instruments: Season 3, Episode 10

3 - 10: Erchomai

In the climactic mid-season finale, the team scrambles to find a way to put a stop to Lilith's plan coming to fruition. But going up against their biggest opponent yet, their odds are not looking good. Meanwhile, Simon makes a heartbreaking choice with Isabelle's help and Magnus reconnects with a powerful person from his past.