Skinchangers, per the books

Greenseeing & warging

The television Three-Eyed Raven is a tidy figure with a clear job. The novels give you something older and less finished: skinchangers who wear beasts, greenseers who look through trees, and a boy learning both from a man half-grown into a weirwood. This is the lore, its rules, and its taboos.

Warging & skinchanging

The commonest surviving magic in the world, and the one with the strictest unwritten laws.

Greenseers & the weirwood net

Rarer than the wargs, and bound up with the children of the forest and the old gods. Later cards sit past the shield.

Book vs show

One word — raven or crow — marks a wider gap between page and screen.

What is warging in Game of Thrones?

Warging is skinchanging into a wolf. More broadly, a skinchanger slips their mind into a beast and controls it, sharing its senses and instincts; 'warg' is the free-folk word for one bonded to a wolf, though fans use it for the whole art. The bond runs both ways — the beast marks the person as much as the person rides the beast.

What is the difference between a warg and a greenseer?

A warg (skinchanger) enters the skins of animals. A greenseer can do that too, but is far rarer and also sees through the red eyes of the weirwoods — perceiving distant places, and the deep past, through the trees. Every greenseer is a skinchanger; not every skinchanger is a greenseer.

Is the Three-Eyed Raven in the books?

Not by that name. The novels call the dream-guide the 'three-eyed crow,' and keep it distinct from the last greenseer in the tree, rather than merging them into one settled character as the show does. If you searched for 'Three-Eyed Raven explained,' the book answer is quieter, stranger, and still unfolding.

Who is the last greenseer?

The last greenseer of the age is the one-eyed man enthroned in weirwood roots beyond the Wall — once a great lord and spymaster of dragon blood, now grown half into the tree, a 'thousand eyes and one.' He takes on a young student and begins teaching what the weirwoods can do. This is spoiler territory for the later books.