The forest is known to be dense and unmarked by trails. Apparently, the woods used to be much larger, enough to cover majority of the lowland of the country before most of it was cut down to make way for the city, as well as to clear out the wolf packs and vampire nests.
In 1984, Valentine Morgenstern's father was apparently killed by a werewolf in the western edge of the forest. In the following months, Valentine made several hunting trips to the forest with his Circle followers in hopes of finding the werewolf that killed his father. During one particular trip, Valentine was with Robert Lightwood and Michael Wayland when they infiltrated the Silverhood manor in the forest, which was being used by a family of werewolves as a home.
While Shadowhunters and Downworlders prepared for the war against Valentine's demons, vampires led by Raphael Santiago at that time settled in the forest and refused to cooperate with the Clave against Valentine unless they surrendered the Daylighter Simon Lewis to them. Simon decided to meet with them in the forest and was accompanied by Maia Roberts. Luke also reunited and allied with his old pack for the war.
In September 2012, a portion, specifically the center, of the Brocelind Forest was blighted with dark magic by the forces of the Unseelie King, making the area a space where Nephilim runes and adamas-weapons would be ineffective.