The entrance to the vast underground necropolis, currently occupied by a large group of Children under the leadership of Motley. This is where you wind up should you fall while in the Valley.
Points of interest
The entrance area has the mutt called Motley and his merry gang of folks busy murdering the Memorialists. It also holds the captive memorialists. Wiping them out yields the Shadowflower.
The tunnel beyond leads to the Necropolis proper and whisperlocked tomb access. Looting the offerings along the way grants you the Candiru bonded item and assorted loot.
The terminal at the end can only be unlocked with the correct name (Guni), learned through The Caretaker's Riddle. Interacting with it allows you to select a tomb to reach, with the right numeric sequence. See Necropolis Tombs for more data. The list below only contains unique, plot-relevant tombs.
Pressing the buttons at random delivers you to a random tomb.