Frenzy (Diablo III)

Frenzy is a Primary  Skill, based on the Diablo II skill of the same name.

In-game
Like, Frenzy hits a single enemy, but each damaging hit increases the attack speed (for this skill only, not for other skills), stacking up to a total bonus of.

When fully stacked, Frenzy compensates its low damage with the ability to deliver very rapid strikes, especially when Dual-Wielding, without sacrificing raw damage. If combined with a high degree of Life on Hit and possibly the  known as, Frenzy grants the Barbarian the ability to heal their injuries greater than what the other Primary skills would be able to do.

Runes

 * Sidearm: Damage type changes to Cold, and each damaging Frenzy hit has a chance to throw a piercing axe in the direction the Barbarian is facing. The axe pierces through enemies and travels up to 35 yards, dealing  damage as Cold to enemies in its path, including the primary target of Frenzy.
 * Berserk: Frenzy now deals Cold damage and generates Fury for the Barbarian per successful strike.
 * Vanguard: While under the effect of Frenzy, the Barbarian also gains Movement Speed per stack of Frenzy.
 * Smite: Damage type changes to Lightning, and each damaging hit of Frenzy has a chance to Stun the enemy for  seconds. Visually, the Stun proc can be identified by a small lightning striking from above.
 * Maniac: Damage type changes to Fire, and each stack of Frenzy also increases all damage done by, not multiplicative with other similar modifiers.

Non-rune enhancements

 * Bastion's Revered (Legendary Two-Handed Mighty Weapon): Attack Speed buff (and other buffs that scale with number of stacks) stack up to 10 times, and hits an additional time per stack. Each additional hit will chain to any enemies within 15 yards and the damage is split between all affected enemies.
 * Oathkeeper (Legendary Mighty Weapon): attacks 50% faster and deals 150-200% increased damage.
 * Depth Diggers (Legendary Pants): damage increases by 80-100%.
 * Simplicity's Strength (Legendary Gem): increases damage by 25% (+0.5% per rank) and heals the character for 4% of maximum Life per hit (rank 25 bonus).
 * Boyarsky's Chip (Legendary Gem): Taunts the first enemy hit for 2 seconds (rank 25 bonus).
 * The Undisputed Champion (Legendary Mighty Belt): Frenzy deals +300-400% damage and gains effects of all runes, elemental damage type matching that of the manually selected one.
 * Vambraces of Sescheron (Legendary Bracers): each damaging cast heals the Barbarian for 5-6% of missing (not maximum) Life.
 * Horde of the Ninety Savages Set (Set bonus for 4 pieces): doubles duration of Frenzy and increases damage resistance by 6% per stack.
 * Horde of the Ninety Savages Set (Set bonus for 6 pieces): Frenzy deals 1000% increased damage per stack.