Here's some scoop on Shadowhunters from Entertainment Weekly's Natalie Abrams' The Spoiler Room column, which was posted on 2/24/17.
What’s going to happen now that Clary can activate the Soul Sword on Shadowhunters? — Susie
At the moment, Simon and Clary might seem to be making the most of their time together, but soon enough everything is going to catch up with Clary. “It’s devastating,” Katherine McNamara says of the Soul Sword realization. “It’s another blow to Clary. She’s trying to do nothing but good in this world, and she’s finding out that she could be the key to the ultimate evil. It’s fighting that darkness within. You saw Jace go through it at the beginning of the season and now Clary’s starting down a similar path.”
Link to the full article:Spoiler Room: Scoop on 'Arrow,' 'Agents of SHIELD,' 'Blacklist' and more