Priority: Major

Description: When Elise used Rappel and Rengar used his passive Unseen Predator from a brush onto a champion chasing us, it revealed the enemy team through the fog of war by their nexus for a second, when we were all the way in the middle of blue sides wolf camp and wraith camp.

My team: Elise, Rengar, Xin Zhao, Varus, and I was Sona. The enemy team: Ezreal, Olaf, Kha'zix, Soraka, and Diana.

Edit: I'm not sure as Rengar did not go invisible for his ultimate, can you use your ult as Rengar, while not going invisible, and still reveal enemy champions if you use your passive immediately for a second?

Edit 2: I can confirm that Rengar's ult range was able to see the enemy champions at level 3 from nexus turrets to destroyed mid tower in between wolf and wraith camp. Although he didn't enter stealth in his ultimate, you can still reveal champions and use Unseen predator onto an enemy champion with his ultimate.

From what I understood from your text, that's what elise rappel do.

Need some more info. Did anyone on your team or their's have a global ult? The description is super vague and all kind of unmentioned variables could be throwing this off.

The only global ultimates were Ezreal and Soraka. Another possibility would be that a minion went by Ezreal to Diana and Olaf, but they were all the way near the nexus turrets when Ezreal was killing off the enemy minions after we destroyed the bottom inhibitor tower. Though, it only shown their champion portraits on the minimap without showing anything else like light around their champion portraits that would of been shown by a minion revealing the area. When this happened the bottom inhibitor tower was taken on the blue side before we backed off and this happened. The middle inhibitor tower was still up along with two top towers.

Rengar's ultimate does reveal enemy champions around the area. Maybe he used it?

You mentioned he was in a bush and he used his passive. Probably happened in a short time between each other and might be that you didn't see him turn invisible in the bush.

You are probably right as his ultimate at level 3 is just enough to go see enemy champions. That is what probably happened.

Ezreal Ult reveals along its path, if the Ezreal was on your team this entire scenario could be easily explained as him ulting and it revealing the nexus for a second or two.