Nemeton (pl. nemeta) is a monster spawning point on the map in The Witcher: Monster Slayer, which is meant to be cleared as a challenge. It resembles a huge, dead tree glowing red. It is indicated in the map view as a white tree inside a circle.
During one challenge session, three random same-class monsters spawn - two of the same difficulty level and one boss. After clearing the nemeton, the player has to wait a few hours for more monsters to appear. However it is possible to speed up the process by placing a bait in the nemeton, making opponents spawn instantly. The ability to purify nemeta unlocks at level 10.
Uncovering the mystery behind the nemeton is the main goal of What Lurks In the Nemeta quest. According to the description in the diary, the nemeton is a product of the Conjunction of the Spheres. It attracts monsters from the area in a mysterious way. Despite resembling a tree, it is an unknown living organism. Nemeta dwelling monsters do not differ from their kind, with the exemption of them not attacking other monsters in the area.