http://www.pcgamer.com/monster-hunter-world-showcases-toxic-rotten-vale-swampland/

Yesterday, we reported on Monster Hunter: World's gorgeous Coral Highlands—an arena bursting with colour and stalked by the cutesy Paolumu. Today, we visit the Rotten Vale swampland that's far less pretty and filled with Radobaan. 

In the following short, the narrator describes the latter as "the skeletal scoundrel who coats his tar-like body with the bones of fallen monsters". It seems less than pleased that the player has stumbled upon its lair, and is even less impressed when a rival Odogaron turns up. Between battling the player in a typically epic showdown, these two beasts lock horns in a vicious turf war.