Only half-sane when in the grip of frenzy, a Berserker can become a juggernaut of death and damage, although the bloodlust is difficult to sustain.

When becoming a Berserker, you gain the following benefits:
+2 Strength
+10 Health

As a Berserker you gain access to the following talents.
More detailed information about each talent can be found on their individual pages.

Berserk	Description	The stench of blood and death drives the berserker into a willing fury, providing a bonus to damage. Rages incur a penalty to stamina regeneration, however, which Constraint reduces. Resilience adds a bonus to health regeneration in this mode.
Type	Sustained	Cooldown	30s	Requirements	none
Activation	-	Upkeep	20	Fatigue	5
Range	Personal	Target Type
Resilience	Description	Rages no longer wear so heavily on the berserker's body. The stamina regeneration penalty applied by Berserk is reduced, and the berserker gains a bonus to nature resistance.
Type	Passive	Cooldown	-	Requirements	Level 8
Activation	-	Upkeep	-	Fatigue	-
Range	Personal	Target Type
Constraint	Description	The berserker has learned to retain control during rages, reducing Berserk's penalty to stamina regeneration.
Type	Passive	Cooldown	-	Requirements	Level 10
Activation	-	Upkeep	-	Fatigue	-
Range	Personal	Target Type
Final Blow	Description	All the berserker's stamina goes into a single swing. If the blow connects, the attack inflicts extra damage proportional to the amount of stamina lost.
Type	Activated	Cooldown	60s	Requirements	Level 12
Activation	5 Stamina	Upkeep	-	Fatigue	-
Range	Personal	Target Type

Specializations in Dragon Age: Origins are not available from the start of the game. In addition to having a free Specialization Point, the character must have found a trainer willing to teach him the specialization before a point can be spent on training it.

Specialization unlocks are persistent between games, meaning that once unlocked in your player profile, your characters can learn a specialization without having to find the trainer first. They can also be unlocked even if the player character does not have the right class to actually learn them.

Spoilers below this point

The Berserker specialization can be taught by Oghren. Alternatively, a manual is available for purchase of a vendor in Denerim near the end of the game.

Spoilers above this point