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During the Peloponnesian War, Klitos worked as a dockhand in Machaon's shipyard in Patrai. One day, Klitos stole documents from Machaon's office, causing Machaon to ask the help of a fellow member, The Silver Griffin. The documents stolen revealed the Cult's plans for the war, how it was controlling both sides of it, and according to Machaon, Klitos also knew the identity of the Sage of the branch and where they were staying.
- While Polemon tells Machaon to find and kill Klitos, Machaon requests the Silver Griffin to send Deimos to deal with the man. Yet, Kassandra finds a note on Klitos' corpse, revealing Machaon's identity. Given all this, it's uncertain who killed Klitos.