Herding

Players can use the Herding skill to select a creature or player and designate it as the target of Focused Aggression for that player's tamed or summoned creatures
A player's tamed and summoned creatures (including Blade Spirits and Energy Vortexes) deal increased damage against a target their owner has marked as the target of Focused Aggression
Players can passively gain Herding skill while fighting with tamed/summoned followers that deal damage to a Focused Aggression target (skillgain chance is scaled upwards based on creature's control slots for balancing purposes)

Focused Aggression

To mark a target for Focused Aggression, players double click a Shepherd's Crook and then target a creature or player they wish to mark

Tamed and summoned creatures deal (25% * (Herding Skill / 100)) additional damage against creatures marked by their controller as the target of Focused Aggression

Tamed and summoned creatures deal (12.5% * (Herding Skill / 100)) additional damage against players marked by their controller as the target of Focused Aggression