Battle of En'rg-ch

Unarmed, droids, he destroyed them using the Destroy Droid ability. Then he encountered one or a few droids, soldiers, Dark Jedi or Sith, defeating all of them.

When he finally arrived at the Sith Temple, they had realized he was an enemy. They turned against him, and he had to fight about 150 Sith, some hundreds of battle droids, many ordinary soldiers, and even some controlled Rancors; and he had to do it unarmed. Eventually, he defeated every single one of them, forever eliminating the En'rg-chan Sith Alliance.

Aftermath
Kaxs left En'rg-ch to defeat the ones of his followers who were out on missions throught the Galaxy. When he was finished, the Galactic Republic had been reorganized into the Galactic Empire.

Directly after Kaxs' treason against the En'rg-chan Sith Alliance and thus also th Confederacy of Independent Systems, the Separatists destroyed the moon En'rg-ch 13 during the Destruction of En'rg-ch 13 as a revenge.

Behind the Scenes
That the CIS (through the En'rg-chan Sith Alliance]] has controlled Rancors is taken from the custom map option on Star Wars: Galactic Battlegrounds, were the Confederacy can have "Rancor (controlled)".