Reim is a Free Elf, born in the Blue Mountains. He fought in Dol Blathanna against humans. He is a great scout and tracker, and it is thanks to his skills that Sabrina Glevissig and Merwin Ademeyn with their retinue have reached the Kaer Morhen valley in "The Price of Neutrality".
He can be found wandering around the vicinity of the Camp, but not usually within its confines. He seems to prefer lurking in the shadows.