Sin entities are dangerous entities that, unlike other entities, only spawn under certain conditions. Once the conditions are met, they would then have a chance to spawn on future floors regardless of their spawn conditions. They are hidden in the Bestiary until at least 1% research is obtained.
Wanderer is a dark humanoid entity with skeletal features. Its head consists of a single red glowing eye that can easily be spotted in dark areas. It is one of the most dangerous common entities due to its deadly slow debuff and fast runspeed.