The Devilian site has been updated with a brief post about how party matching will be handled. Players will be able to open the Party Matching tool to find others looking for dungeon partners and groups. Joining will instantly teleport members to the specific dungeon where the battle against ever-increasingly difficult monsters will commence.
Party Matching can also be used to find a group for Archdevil Dungeons, extremely challenging dungeons that can only be done in a group and should only be attempted if you have sufficient equipment from doing standard dungeons. You can also use Party Matching to pair you with other Devilians in Infinite Hunting Grounds. Joining an Infinite Hunting Ground allows you to immediately join an adventure and challenge Rifts and open world bosses with a group.
Read more of the details on the Devilian site.