This page in our guide for Assassin's Creed: Odyssey focuses on the following quests: To Kill or Not to Kill; White Lies and Blackmail; Gluten Free; Judge, Jury, Executioner.
To Kill or Not to Kill
Time to go to Arkadia and meet with Myrrine and Brasidas. Go to the meeting spot and you will encounter a mercenary. The conversation ends with a fight. Win and then speak with the man. You can tell him to help you find your mother or you can threaten him. After that you can convince him to cooperate or you can keep forcing information out of him. Your decisions determine whether the man helps you or must be killed.
You learn where Myrrine is. Speak with her and with Brasidas. The characters decide how to kill another Cultist of Kosmos. You can choose Brasidas' or your mother's plan. This choice determines what the next quest will look like. Rewards: 16,200 XP.
White Lies and Blackmail
This is Brasidas' plan. Speak with the man. After that you have to overhear the conversation. Move a bit to the north. Soon, you will reach the Cultists. Kill them and free the prisoner.
After that you have to go to the hideout. Go down to end this quest. Rewards: 16,200 XP.
This is the continuation of the previous quest. Go down and search the cave. You will come across a few enemies. Kill them stealthy.
You finally reach Lagos' family. Free them to complete this quest. Rewards: 17,100 XP.
Judge, Jury, Executioner
Time to deal with Lagos. Go to the man's house - he is waiting for you. The conversation depends on your choices regarding Brasidas. You can convince him to leave the Cultists of Kosmos - this is possible if you have killed the Monger alone in the cave and if you have rescued Lagos' family. After that the quest will end.
Otherwise, you will have to kill Lagos. Go back to Myrinne and Brasidas. This ends another main quest.