Weapon Focus

Requirements -

Choose one: slash, pierce or crush

You can use the default special attacks of these weapon types (cleave/lacerate, lunge/pierce defense, backbreaker/concussive strike) at-will.

You also gain a new one depending on the type you chose, usable 1/combat.

Slash: Great Cleave - Attack all creatures within reach

Pierce: Impale - Creature struck provokes an AoO if they move by the start of your next turn.

Crush: Pulverize - Stagger on hit (fort negates)

The default and newly acquired special attacks also add your level to damage.

If you have the unarmed combatant feat, then you can apply the effects of weapon focus (crush) to the special attacks granted by it.