The Filthy River of Pyphlegethon

AKA-
 * River of Fiery Blood
 * Gulf of Bloodlust
 * Entryway to Nequam

The River of Pyphlegethon is the open Entryway of Nequam. Spirits (Demons) or Sentients (Waverers) that go here become mad with insidiousness, bloodlust, and evil doing due to the River's Filth of Fiery Blood. The Vampire Mother of Aim was named after this place for losing her purpose as a follower of the Holy Sire, and this is why Aim is struck with insidiousness.