Guided by a sentient map named Blib, who only spoke in limericks, they found their way to Harfer's Tower. The structure floated atop a whirlpool of starlight and was only accessible by solving riddles sung by interdimensional flamingos.
Inside, they found the Symphony Chamber, where Harfer allegedly composed music that altered gravity, time, and even mood.
"Behold the Echo Engine," said a hologram of Harfer, flickering to life. "With this, I nearly undid reality."