What is the main conflict in A Dance with Dragons: A Song of Ice and Fire: Book Five by George R.R. Martin?

The story opens with the introduction of Varamyr, a human who is able to "warg" into other life forms, including wolves. Many characters throughout the story can leave their bodies and force their spirits into another for various purposes. This causes some conflict for humans who turn into animals since they are often required to hunt other humans for food.