Erchomai[3] is the tenth episode of the upcoming third season of Shadowhunters: The Mortal Instruments.



  • 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.[4][5]
  • This episode will feature a song by Ruelle that was written specifically for the final scene of the episode.[6]