The Dark Brotherhood is a group of stalkers similar to Sin. However, they are not religious fanatics. They live, as a rule, far enough away from stalker trails, so as not to particularly catch anyone's eye. Rumor has it that they are even harder to meet than a member of the Sin group. If you believe the rumors, then according to one version in the past they were experimented on in secret laboratories on the territory of the Zone, which did not seem to affect their appearance in any way, but something not very good happened to their psyche and they are now shunning everyone. According to another version, this group represents the renounced members of the Sin group, who are tired of the religious oppression of the group and decided to peacefully get as far away from it as possible and live peacefully in the unexplored territories of the Zone.