This years Final Fantasy XIV Fan Festival in Las Vegas has played host to a number of big announcements, including the reveal of the games next major expansion in the shape of Shadowbringers, and amongst them one of the most interesting was the Trust NPC system. Final Fantasy XI players may well recognise the name, as a similar system existed for the older MMORPG and allowed players to call on alter egos of characters theyd met in order to tackle certain content as a solo player.
Source: N4G PC Final Fantasy XIV's Trust System Brings A Single-Player Experience To The MMORPG