(1) Rivals collect takedowns, gaining 3 if they takedown another Rival.
Takedowns evolve Kha'Zix, permanently granting him your choice of Executioner, Rapidfire, Ravager, or Spellweaver.
Rengar grants 2/3/5 gold every 8 takedowns. After 30 takedowns, your team gains 5% Attack Damage plus 0.2%

per additional takedown.
Kha'Zix Takedowns: 0 / 0
Rengar Takedowns: 0
Gold Earned: 0
(2) Rivals can be fielded together, and their abilities grant each other bonuses.