The Acolyte Episode 7: The Jedi Were on Brendok For a Force Vergence
One of the many questions from The Acolyte episode 3 was why the Jedi were on Brendok in the first place. Episode 7 immediately answered that question, showing Brendok from the Jedi's perspective. In The Acolyte, the Jedi were sent to the planet to investigate the mysterious growth of life. Indara revealed that Brendok was once lifeless due to a hyperspace disaster, a major event in the Star Wars High Republic Era books.
The Jedi were sent to investigate the planet because they believed that a Force vergence was responsible for its flourishing. In Star Wars, Force vergences are concentrated areas of the Force linked to a place, person, object, or an entire planet. The vergence on Brendok was causing life on the planet, which is why the Jedi were sent to investigate.
The Acolyte Episode 7: What Really Happened to the Witches of Brendok
The dead bodies of the Brendok witches, seemingly untouched by the fire that killed them, was a major hint that more mysteries lay at the center of The Acolyte episode 3. Episode 7 revealed what happened to the witches, and how the Jedi were involved. After realizing that Mae and Osha's origins were linked to Brendok's Force vergence, Torbin rushed to take the girls back to Coruscant to end the mission.
Sol pursued Torbin, and the two were confronted by the witches at their compound. As tensions rose, Mae appeared to tell Aniseya that the fire she started was threatening Osha's life. Aniseya tried to use dark side Force power to save Osha, causing Sol to retaliate out of fear. Sol stabbed Aniseya with his lightsaber, killing her, and forcing the rest of her coven to attack the Jedi. Kelnacca arrived to help his comrades, and the witches used their powers to enter his mind and force him to attack Sol and Torbin. Indara arrived and subdued Kelnacca, using the Force to free his mind. The remaining witches fell to the ground, dead, likely due to the strain of overpowering Kelnacca and Indara's push-back. The witches were forced to exert a lot of energy to take over a Wookiee's mind, and Indara's Force power likely overwhelmed them.
The Acolyte Episode 7: Mother Koril Escaped Brendok
One of the bigger reveals in The Acolyte episode 7 concerned Mother Koril. Episode 3 showed that Koril possessed more darkness than Aniseya, which was revealed in Episode 7's return to Brendok. Koril was indirectly responsible for the fire that Mae started, pushing her child to stop Osha from leaving. After the Jedi arrived at the compound, Koril was partly responsible for starting a fight with the warriors by acting antagonistic, combined with Sol's decision to kill Aniseya.
Before the fight escalated, Koril fled. Like Aniseya, Koril possessed the ability to transform into a cloud of dark side energy. Koril used this power to flee Brendok as Kelnacca arrived, which could mean that she will have a bigger role going forward. Koril's body was not shown, which suggests that she survived and is influencing events in the present-day story of The Acolyte.
The Acolyte Episode 7: Why Did Sol & Indara Lie to the Council?
In the final scene of The Acolyte episode 7, Indara, Sol, and Torbin weighed their options. Indara said that they should tell the Council the truth, only with missing parts. Indara's "truth" was that Mae started the fire that resulted in the deaths of the Brendok witches. The fire caused Aniseya to reveal her true form, Sol to kill her, Koril and the witches to possess Kelnacca, and Indara to free the Wookiee and indirectly kill the witches.
Indara and Sol decided to lie to the Council and leave out their involvement in the witches' deaths because they felt guilt and wanted to protect Osha. The Council wouldn't let Osha become a Jedi if they found out about her origins, which would take away her dream. Another factor in their secrecy was guilt. The Jedi felt guilt about their involvement on Brendok, which extended to Sol, who killed Aniseya and allowed Mae to fall to her apparent death to save Osha. Indara's guilt likely stemmed from not controlling the situation better. If the Council was told of what happened, the Jedi would have to confront their guilt, turning The Acolyte's warriors of peace into liars who mean well.