Passive- Unseen Predator
Rengar's abilities give him 1 stack of ferocity at 4 stacks of ferocity rengar's next ability is empowered and gives him 30%-50% (based on level) bonus movement speed.

While in a brush rengar's autoattacks work as a leap and have huge range. Jumping from a brush while at 0 stacks offerocity gives rengar 1 stack of ferocity.

When you kill an unique enemy champion, you get a stack on your bonetooth necklace. For every stack you get bonus damage scaling that goes: 1%, 4%, 9%, 16% and 25% for the last stack.

Q- Savagery
Rengar's next two autoattacks have 40% extra attacks speed and the next autoattack does extra damage.

Empowered Savagery
Damage is higher and applying it gives rengar bonus attackspeed for 5 seconds.