You believe your Uncle is still alive and you mean to find him.
This is the first quest you are ever given – think of it as a ‘meta quest.’ As such I’m keeping the description really loose.
– Find evidence that your Uncle is alive (you find a carrier pigeon note at his Estate, as well as a letter he left behind for you before leaving in a hidden part of the estate)
– Find out how your Uncle got across the guild (piece together clues to realize he used a machine)
– Get across the Rift (bring everyone together to build a new machine yourself)
– Find your Uncle (you find him in the Uncharted Lands)
At that point the quest is complete and the story moves forward into the ‘third act.’