Increases Ray of Frost/Acid Cloud/Spirit Barrage/Zombie Charger/Sacrifice/Firebats Damage by 10–15% (Wizard Only).

Increases Meteor/Disintegrate/Energy Twister/Arcane Torrent/Wave of Force/Arcane Orb/Ray of Frost Damage by 10–15% (Wizard Only).

Increases Whirlwind/Seismic Slam/Ancient Spear/Hammer of the Ancients Damage by 10–15% (Barbarian Only).

Increases Cluster Arrow/Multishot/Elemental Arrow/Strafe/Chakram/Rapid Fire/Impale Damage by 10–15% (Demon Hunter Only).

It's a popular item for Barbs, with a good bonus to strength and guaranteed resistances.

Reduces resource cost of Rend by 1–4 Fury.

Reduces resource cost of Weapon Throw by 1–4 Fury.

Increases Critical Hit Chance of Revenge by 4%.

Other classes find them less useful since the big strength bonus is only really beneficial to Barbarians. They have good but not great stats, and can be a fine item for Barbarians. These are a popular item, especially for Barbarians with potentially a very high strength roll.

Critical Hit Chance Increased by 6.0–6.5%.

The Eternal Reign is the chest armor, and a very powerful and popular items for Barbarians of any build.

Increases Heaven's Fury/Falling Sword/Condemn Damage by 10–15% (Crusader Only).

Increases Dashing Strike/Seven-Sided Strike/Mystic Ally/Sweeping Wind/Cyclone Strike Damage by 10–15% (Monk Only).

Increases Wall of Zombies/Gargantuan/Fetish/Summon Zombie Dogs/Locust Swarm/Haunt/Grasp Damage by 10–15% (Witch Doctor Only).

Increases Blizzard/Familiar/Hydra/Explosive Blast Damage by 10–15% (Wizard Only).

Increases Overpower/Revenge/Earthquake/Rend Damage by 10–15% (Barbarian Only).

Increases Rain of Vengeance/Sentry/Spike Trap/Fan of Knives Damage by 10–15% (Demon Hunter Only).

Increases Companion Damage by 10–15% (Demon Hunter Only).

This item has an awesome in-game graphic, which is more the shame that hardly anyone gets to see it. The Boulder Breaker is the weapon and the least-used item in this set, since many barbarians prefer to dual wield, or to use the Skorn if they go with a two-handed weapon.

Barbarian ? immortal king?s call