Joining a faction in the final era has several advantages for your in-game character. With the release of version 1.0, there are currently two factions available to join, namely the Circle of Fortune and the Merchant's Guild. Those who have better trading skills should definitely opt for the Merchant's Guild. This faction gives you access to the Bazaar, where you can sell and buy legendary items. Additionally, it is also possible to trade with other players in the lobby.

If you want to join the Merchants Guild in Last Epoch and test your trading skills, you can get started here.

To join the Merchant's Guild faction, you must be at level 9 and in the Divine Era. You will then need to talk to an NPC named Zerrick in the Maj'Elka Upper District. Zerrick will then introduce you to both factions and reveal their Base of Operations. To join a faction, you will need to go to that Base of Operations and talk to the faction leader. So to join the Merchant's Guild in the Last Epoch, you will need to go to the Bazaar. This is located on the eastern side of the Maj'Elka Upper District.

Note: You visit Maj'Elka District once before reaching level 9. However, at that time, the Factions feature is not available. So being in the Divine Era is a major requirement for joining a Faction.