Reim was a free elf born in the Blue Mountains. At one point, he served in Dol Blathanna in the fight against humans. He was noted as being a great scout and tracker, and it was thanks to his skills that Sabrina Glevissig, Merwin Ademeyn and their retinue were able to reach the Kaer Morhen valley.
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.