The event begins a seemingly random length of time after the following conditions have been met, and can only occur once per game:
- has used all three points, which requires a minimum of level 16.
- must have 5 Trophies.
- All members of both teams must be alive at the same time. 
takedown the other. The first to achieve this claims victory and is rewarded.and are assigned to
- Rengar must kill first to become the ultimate hunter. Rengar stalks , his greatest prize, and the one beast to have escaped him. If Rengar is victorious, his is replaced with the , which provides a 6th stack for his Bonetooth Necklace. He also gains a buff with the title . If he fails, he gains a buff with the title .
"This twisted monster has evaded me for too long. I will have his head!"― Rengar
- Kha'Zix must kill first in order to become the ultimate predator. Kha'Zix is ready to devour , his greatest prey. If Kha'Zix is victorious, he gains a fourth point, which allows Kha'Zix to evolve all of his four abilities. He also gains a buff with the title . If he fails, he gains a buff with the title .
"I have grown and adapted since I took his eye. I will feast on lion!"― Kha'Zix
- When the event begins, there is a chime and players receive a "Quest Received" notification.
- A video describing the event.