User blog comment:Kogath/Monster Hunter: World Discussion/@comment-6050823-20171030175744

Rotten Vale and Radobaan

Rotten Vale
 * The Rotten Vale is a deadly valley filled with the corpses and bones of countless monsters. This area is always in a constant state of decay, making inhospitable for most creatures. Despite this, some monsters do live in the Rotten Vale.
 * The monsters in this area are extremely hostile and won't hesitate to attack any intruders in the Rotten Vale.
 * A toxic gas leaks from the Rotten Vale, making the area more hazardous for hunters. This gas can endanger a hunter's life.

Radobaan
 * Radobaan is a close relative of Uragaan found within the Rotten Vale.
 * Unlike Uragaan, Radobaan doesn't feed or adheres minerals to its body. Instead, Radobaan covers its body in the bones of other monsters in order to forge its own armor for protection against predators. However, the bones can easily be knocked off if enough damage is applied to parts of Radobaan.
 * Despite its size, Radobaan is fairly quick compared to Uragaan.

Source: http://www.capcom-germany.de/2017/10/playstation-4-beta-erste-blicke-ins-tal-der-verwesung-und-exklusive-horizon-zero-dawn-dlc-inhalte-fuer-monster-hunter-world/