Berserker is an enemy exclusive class from Fire Emblem: Mystery of the Emblem, unrelated to the later Axe using Berserker class introduced in Thracia 776. It appears to be an enemy exclusive variant of the Hero class.
The Berserker class is exclusively used by a generic enemy in chapter 11. This enemy is labeled Evil Fighter and wields the Master Sword. In the remake, the Berserker is replaced with a Swordmaster wielding the Master Sword, while the Evil Fighter title is removed. On harder difficulties, there are two Swordmasters wielding Master Swords, but only one sword is droppable.
Like most unplayable classes in Mystery, the Berserker has no player palette, incomplete data for using the Arena, and their overworld graphics only work in certain maps.