At the West part of Undergrowth, something interesting is happening. The area there is covered in a navy blue glow with many golden shiny flakes falling from the ceiling from nowhere. Heavenly music hums throughout the area. The creatures there seem to have instantly fallen asleep but you haven't. Looks like your cycle has overlapped with another...

The closer you get to the Echo, the louder the music gets and the more vibrant the navy blue is along with more golden flakes falling more frequently.

You finally reach the Echo's location, just through that pipe into the other room is where the Echo lies...