No. They did no ritual. The only people there were Revan and Malak.
Revan unleashed the lightning when they crash-landed on the planet.
Please watch this: https://www.youtube.com/watch?v=4Qy9l5JJV20
"They tried to take you prisoner, but you unleashed your magic - what you called the Force - upon them. Seeing your power they bowed before you and brought you here to me."
-The One (Star Wars Knights of the Old Republic)
I was just curious, as I've never heard of that ability being used in combat before...
Alright, that's fair enough, but that ability is not the same as regular lightning--It's likely not something that Revan could just conjure on the spot as he could regular FL.
Also, that particular feat was done on an immensely strong nexus of the dark side.
I made two counter-arguments. Choose the one you like the most.
Defense 1: Mid-chichlorians
So, I was wondering when someone would mention this, so now I can present a logical explanation of Force nexus' and how they affect feats:
Canonically, a Force nexus is an area where the Force is unnaturally powerful. It boosts one's power through midi-chlorians.
Midi-chlorian's are microscopic life-forms that reside within the cells of all living things. The amount of midi-chlorian's one has determines their force-sensitivity.
Many forget that all *living* species' have midi-chlorian's inside of them. Rancors as well have midi-chlorian's inside of them.
The conduct of the Force evenly flows through all life with the midi-chlorians as their conducts. The Force is ultimately non-existent in matter that is not alive, such as rocks.
Below are *fake* numbers of representations of Revan's midi-chlorian count, and then a rancors. The numbers have no impact on the outcome, hence why they can be *fake*.
Revan's midi-chlorian count: 17,900
A rancor's midi-chlorian count: 2,500
(Yes, these numbers are awful. But it doesn't change anything).
The Force equally flows through all these midi-chlorians, and when on a nexus, add's extra energy. Both Revan, and the rancor, would have their powers equally amplified.
The Force does not exclude semi-sentients, in fact, the intelligence of one creature determines nothing. The Force goes through all *life*, not all Force-sensitives. People fail to realize this.
This is why rancors were such extremely tough on a world like Felucia with them being amplified by Shaak Ti when Galen Marek came and caused havoc among the entire world.
And yes, once again, the Force *does* affect the abilities of non Force-sensitives. Read The Old Republic: Annihilation by...um...Drew Karpyshyn.
Defense 2: Not a Nexus
Even besides this, numerous other evidence suggests the world was not really a dominant Force nexus as it was when Darth Bane came.
In Star Wars: Knights of the Old Republic, Rancors roam directly next to the Temple of the Ancients with no trouble or strain.
Meanwhile, when Darth Bane went with a rancor, the rancor was extremely reluctant to even go *near* the Temple of Ancients.
In fact, when Darth Bane allows the beast to roam directly in front of it, the rancor "turned and fled back into the undergrowth."
No quotes in KotOR suggest that the Unknown World was a nexus during Revan's time. This is only logical, since the Rakata are immune from the Force.
Therefore, Darth Revan's powers would be amplified by...basically nothing, tbh, based off the rancors. 🙂