These are creation of Gaia, animals endowed with energy of the Ether. More commonly known as orcs and all sorts of monstorous humanoids. They were created with the purpose much like elves and dwarves. To protect the landscape they inhabit. Initially there was no animosity in the culture of beastmen, until the devils tempted many clans with the power of Nether and perverting energy of the chaos plane known as Maelstrom afflicting the locals. You will find as much honor amongst the beastmen as you would the acts of cruelty.