The Berserkers are those that had been "chosen" by the nectar. They have enhanced human bodies that gain size and muscle remarkably fast because of the nectar that fully comprises their veins.
Creatures of pure hell. Created and controlled by Alfred Furnace himself. Not even the Furnace prision can contain them. The kids that turn into berserkers are chosen by the nectar. A notable Berserker is Gary Owens. Gary gets turned in Solitary