Ferocity

is a damage stat that increases the chance of attacks hitting multiple times.

The maximum number of hits per second with and  can be calculated using this calculator:

Mechanics
Each point of grants a +1% chance for an attack to strike an extra time. For example, with 50 it grants the player a 50% chance for their attack to hit twice. above multiples of 100 also allow for extra triggers, meaning above 100 allows your attack to strike three times, and so on. For example, 250 would grant a 100% chance to strike three times, and a 50% chance to strike a fourth time.

works on melee and arrows, but not magic.

is always visible in player's stats tab.

does not activate or.

When using melee weapons, fails to activate when the player is more than 6 blocks away from the target.

Increasing Ferocity
Note: The Tiger Pet gives up to +30% multiplicative and +25 additive. The Katanas bonus only affects Endermen. Final Destination Armor's bonus only affects Endermen. The needs to be brewed with a  to take effect.
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Trivia

 * Killing an Enderman with a strike causes its death sound to not play.
 * Using a Bow can activate Ferocity from range.
 * This is especially noticeable in the Voidgloom Seraph fight as this ability can destroy the Hitshield rapidly. However, Explosive Arrows or a bow that can damage Endermen is required to do this. It is recommended to use Juju Shortbow or Terminator to achieve this.