Mother Mayhem finally brings Sebastian to the Temple of Azarath.
This episode is arguably the strongest of the season. It successfully pays off the "Brother Blood" origin story while leaving the audience genuinely worried for the team. It bridges the gap between the grounded crime-fighting of early seasons and the cosmic stakes of the series' end.
She uses his deep-seated loneliness against him.
The episode centers on the tragic transformation of Sebastian Sanger.