From the Multiplayer menu, you can set a Multiplayer Password and use the Duelist's Furled Finger (recommended) or Tarnished's Furled Finger to place a summon sign. Using Duelist's Furled Finger to summon can prevent other players from invading. Then you will be invited to the world of the players who use the same Multiplayer Password. If you want to check the summon signs left by other players, you should use the Furlcalling Finger Remedy. When you want to return to your own game, you should use the Finger Severer.