Erchomai

Erchomai
Broadcast Information
Premiere date	May 15, 2018
Written by	Bryan Q. Miller
Directed by	Jeffrey Hunt
Episode GuideSeason Three 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
← Familia Ante Omnia
Lost Souls →
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Erchomai is the tenth episode and the second half of the two-hour midseason finale of Season 3 of Shadowhunters: The Mortal Instruments.

Plot

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.

Credits

• Cast

Starring:

• Katherine McNamara as Clary Fairchild
• Dominic Sherwood as Jace Herondale
• Alberto Rosende as Simon Lewis
• Matthew Daddario as Alec Lightwood
• Emeraude Toubia as Isabelle Lightwood
• Alisha Wainwright as Maia Roberts (credited only)
• Isaiah Mustafa as Luke Garroway
• Harry Shum Jr. as Magnus Bane

Guest-starring: Anna Hopkins as Lilith Jack Yang as Asmodeus Alexandra Ordolis as Ollie Nicola Correia-Damude as Maryse Lightwood Christina Cox as Elaine Lewis Holly Deveaux as Rebecca Lewis Conrad Coates as Lt. Dwyer

Co-starring: Jacob Skiba as Young Jonathan Neeraja Ramjee as Disciple 1 Daniel Coz as Disciple 2 Danielle Ayow as Admit Nurse Samora Smallwood as Uniformed Officer Luke Marty as Security Guard

Multimedia

See more here

Videos

See more here

TMI 3x09-10 Promo Preview

Promo for the 2-hour Spring Finale

Images

See more promotional images here and stills here

Music

• "Silence Says It All" - Caroline Pennell
• "Fire Meets Fate" - Ruelle

Trivia

• Production notes
• In the books

• The title "Erchomai" is the romanized Greek word έρχομαι, which means "to go", "to come", or "I am coming". It is a reference to the books where, in City of Lost Souls, Sebastian left the message "Erchomai" at the New York Institute, ominously warning them of his return and retaliation.
• Filming for this episode (and thus 3A) ended on December 6, 2017.
• This episode was originally set to air on May 29, 2018, before the schedule was changed; it was announced in April that the episode will instead air alongside the 9th episode on May 15, 2018.

The following are elements adapted from The Mortal Instruments book series:

• Rebecca accepted Simon after she found out that he was a vampire.
• Lilith bound Jonathan Morgenstern to someone with a mark for his rebirth.

For differences, see here.