Rengar

If in brush of camouflaged, leaps to the target with his next attack.If Rengar's Ferocity is lower than 4 and he doesn't have any Ferocity gained from attacks during the attack, he gains 1 Ferocity.Bonetooth Necklace: Gain 4% - 20% Attack Damage for each unique champion takedown. Each enemy champion only provides this bonus once.- Gains 1 Ferocity upon casting a basic ability ( if casting Savagery, Rengar must hit a target with an empowered attack to gain this bonus).- Reaching 4 Ferocity empowers his next basic ability. Casting the empowered ability does not refresh the basic ability's cooldown.- Gains 30% - 50% Movement Speed (increases at level 1 / 6 / 11) for 1.5 seconds upon casting an empowered ability.All Ferocity is lost 8 seconds after leaving combat.