Reavers are genuine terrors, masochists who flirt with their own death in the hopes of ushering in that of their enemies.

When becoming a Reaver, you gain the following benefits:
+1 Constitution
+5 Physical Resistance

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

Devour	Description	The reaver revels in death, absorbing the lingering energy of all nearby corpses, each of which partially restores the reaver's own health.
Type	Activated	Cooldown	30s	Requirements	none
Activation	25 Stamina	Upkeep	-	Fatigue	-
Range	Personal	Target Type	Area of Effect, Sphere (5m), Self Centered
Frightening Appearance	Description	This talent focuses the reaver's unsettling countenance into a weapon, making a target cower in fear unless it passes a mental resistance check. Frightening Appearance also increases the effectiveness of Taunt and Threaten.
Type	Activated	Cooldown	20s	Requirements	Level 12
Activation	25 Stamina	Upkeep	-	Fatigue	-
Range	Personal	Target Type
Aura of Pain	Description	Radiating an aura of psychic pain, the reaver takes constant spirit damage while this mode is active, as do all enemies nearby.
Type	Sustained	Cooldown	45s	Requirements	Level 14
Activation	-	Upkeep	60	Fatigue	5
Range	Personal	Target Type
Blood Frenzy	Description	Driven by pain, the reaver gains larger bonuses to damage whenever health decreases. Because this mode also incurs a penalty to health regeneration, the reaver flirts with death the longer the frenzy persists.
Type	Sustained	Cooldown	60s	Requirements	Level 16
Activation	-	Upkeep	60	Fatigue	5
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 Reaver specialization is taught by the cultist Kolgrim in a temple close to the Village of Haven. Note that only completing this quest will prevent Champion from being available for training in the same playthrough.

Spoilers above this point