Board Thread:Warhammer 40k General Discussion/@comment-9558536-20130517084538/@comment-3258762-20130520115827

Well, the reason is that humans have a much stronger psychic resonnance in the Warp. The Eldar are more connected to it, but they're also a much more controlled people, and due to their longevity they do not fall to emotions as easily (until they started sexing it up and giving birth to a Chaos God :p ) while Orks do not respond in a similar way to things. Humans search for answers in the divine, and so when pestilance struck, people prayed for help. Their despair and their prayers in a higher being became Nurgle, and in the Warp Nurgle warped past what he was supposed to be, a merciful god who decided when to meet out disease, into a god who only wanted to spread disease. Same happened for every other god. In the Warp, even good things become bad. Tzeentch was born from hope so :3