Until the End of the World Genshin Impact quest
Wait until morning the next day (08:00 – 12:00)
Go to Constellation Metropole Station
Go to Constellation Metropole Station
Ride the Maritime Express to the end of the world
Arrive at the transfer station and change trains
Defeat the monsters and connect the train carriages
Talk to the conductor and prepare to depart
Continue riding the Maritime Express to the end of the world
Talk to everyone
Look for the dragon scale
Look for the dragon scale
Obtain the dragon scale
Talk to everyone
Go near the waterfall where the fell dragon resides
Use the dragon scale to enter the waterfall
Explore the space within the waterfall
Explore the space within the waterfall
Go deep within the fell dragon’s lair
Listen to the voice near your ear
Listen out for the voice near your ear
Go deep within the fell dragon’s lair
Return to the Broken Sea and talk to everyone
source
At 19:22, there is a common chest near that guy.