The Forbidden Grove
The Forbidden Grove is the primary world area for a Yaesha Corrupted Ravager roll. It is therefore the location for the world's Biome Portal.
The Water Harp
Central to The Forbidden Grove is the Water Harp, a huge musical instrument powered by the neighboring waterfall. It is the key that opens the way to the Ravager's Lair and to obtaining the Bolt Driver Hand Gun and the Scroll of Binding Crafting Material.
Find the Music
Power the Harp
Set the Tune
Start the Harp
Simulacrum
The Forbidden Grove is home to three possible Simulacrum locations. These are in the immediate vicinity of The Lost Temple World Stone next to the #Water Harp.