The Peloponnesian League, Assassin's Creed Odyssey Quest

1. Uncover and assassinate the Peloponnesian League branch 0/6

You have to uncover and kill: Skylax the Fair, Monger, Lagos the Archon, Kallias, Silanos of Paros, and Pausanias.

Skylax the Fair

A clue (Donation note) that will help you find this Cultist is located in the National Treasure Chest in the Xerxes Military Fort in Lokris.

Skylax the Fair can be found in his camp on Euboea island.

Items: Spartan War Hero Armor (Legendary Torso, Spartan War Hero Set), Peloponnesian symbol on Skylax's breastplate (Cultist Clue)

Monger

Monger is in Korinthia and you will face him in one of the main story / odyssey quests - Monger Down.

Items: Spartan War Hero Helmet (Legendrary Head, Spartan War Hero Set), Sage Letter to the Monger (Cultist Clue), Monger's Men (Epic Crew Theme)

Silanos of Paros

You will receive the clue (Cultist Attack on Naxos) when you complete the main story / odyssey quest - Death and Disorder, and you will face Silanos of Paros (He is on the ship) in Unified Front quest.

Rewards: Spartan War Hero Gauntlets (Legendary Arms, Spartan War Hero Set), Olympic Declaration (Cultist Clue).

Lagos the Archon

You will face Lagos the Archon in main story / odyssey quest Judge, Jury, Executioner.

Items: Spartan War Hero Belt (Legendary Belt, Spartan War Hero Set)

Kallias

The first clue (Olympic Declaration) about this cultist drops from Silanos of Paros. Kallias is in Ellis and you will be able to face him when you complete another main story / odyssey quest - The Contender.

Items: Spartan War Hero Boots (Legendary Legs, Spartan War Hero Set), Sage Letter to Kallias (Cultist Clue)

Pausanias

You will unveil and face Pausanias in the main story / odyssey quest A Bloody Feast.

Items: Xiphos of Dionysos (Legendary Sword), The Ghost's whisper to Pausanias (Cultist Clue)