Silksong walkthrough explains exactly where to go and what to do to complete The Old Hearts main objective in Act 3.

Head down from the Quick sling, and instead go east to find 2 long horizontal rooms full of Slubberlugs. These maggot-fish ...

What are the Silksong map locations? Travel through Pharloom, the vast interconnected world of Silksong as Hornet, the hunter on a mission to defeat the evil insects attempting to take over the land.