During one of the main story quests in Assassin’s Creed Odyssey, you will encounter a Kosmos Worshipper called Chrysis. However, this worshipper has something suspicious about her, and you will eventually be tasked to kill her. In fact, the quest involving Chrysis in AC Odyssey can potentially be one of the darker side stories the series has ever attempted to showcase.
https://screenrant.com/find-chrysis-assassins-creed-odyssey/