Azronger
In Darth Bane: Path of Destruction, the titular character and the Brotherhood of Darkness perform a ritual in which they devastate the planet of Ruusan. The ritual is described multiple times as a global event that annihilated armies of Jedi and Sith:
"Can you feel it?" he screamed, feeling as if the raw power of the Force roaring through him might rip his very flesh asunder. "Are you ready to kill a world?"
The storm rolled down from the plateau and rumbled across the forest. Hundreds of forks of searing lightning shot down from the sky - and the forest erupted. Trees burst into flames, the blaze racing through the branches and spreading out in all directions. The underbrush smoldered, smoked, and ignited; and a wall of fire swept across the planet's surface.
The inferno consumed everything in its path.
Darth Bane: Path of Destruction
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Here is the ritual itself from the novel. I will highlight every piece of text that indicates all the power of the Brotherhood was concentrated within Bane, as that becomes relevant in my next point:
He had discovered the ritual she spoke of while studying Revan's Holocron: a way to unite the minds and spirits of the Sith through a single vessel so their strength could be unleashed upon the physical world.
Kaan, Githany, and the rest of the Dark Lords had gathered atop a barren plateau overlooking the vast forests where Hoth and his army were hiding. They had come on their fliers: short-range, single-person, airborne vehicles front-mounted with heavy blaster guns. The fliers were parked at the edge of the plateau, fifty meters away from where the Sith sat in a loose circle. The ritual had begun.
They were communing with the Force, all of them slipping into a meditative trance as one. Their minds drifted deeper and deeper into the well of power contained within each individual, drawing on their strength and combining it through a single conduit. Bane stood in the center of the circle, urging them on.
"Touch the dark side. The dark side is one. Indivisible."
The night sky filled with dark clouds and a fierce wind swirled across the plateau, tearing at the cloaks and capes of the Sith. The air shook with the thunder and crackle of a mounting electrical storm. Bolts of blue-white lightning arced through the air, and the temperature suddenly dropped.
"Give yourself over to the dark side. Let it surround you. Engulf you. Devour you."
The Brotherhood slipped deeper into the collective trance, barely even aware of the storm now raging about their physical selves. Bane stood at the eye of the storm, drawing the bolts of lightning into himself, feeding on them. He felt his strength surge as he channeled and focused the dark side from the others.
This is how it should be! All the power of the Brotherhood in one body! The only way to unleash the full potential of the dark side!
"Do you feel invincible? Invulnerable? Immortal?"
He had to shout to be heard above the howling wind and thunder. A web of lightning spiraled out from his body, connecting him to each of the other Sith. He shivered then suddenly went stiff, arms spread out at his sides. Slowly, his rigid body began to rise into the air.
"Can you feel it?" he screamed, feeling as if the raw power of the Force roaring through him might rip his very flesh asunder. "Are you ready to kill a world?"
There was very little in the galaxy that could scare a man like General Hoth. Yet as he sat looking over the latest situational reports from his scouts he felt the first glimmers of real fear gnawing away at the base of his skull.
The rift between himself and Farfalla had been mended, but now there was no way to get the reinforcements down to Ruusan's surface. Small messenger ships with a crew of one or two had been able to slip past the Sith blockade undetected, though on occasion even these vessels had been spotted and destroyed. Anything larger would never make it.
But his fear was more than the result of his frustration at having help so near yet so impossibly far away. There was something sinister in the air. Something evil.
Suddenly an image leapt unbidden to his mind: a premonition of death and destruction. He sprang to his feet and ran from his tent. Even though it was the middle of the night, he was only mildly surprised to see that most of the rest of the camp was up and about. They had felt it, too. Something coming for them. Coming fast.
They were looking to him for leadership, waiting for him to take command. He did so with a single, shouted order.
"Run!"
The storm rolled down from the plateau and rumbled across the forest. Hundreds of forks of searing lightning shot down from the sky-and the forest erupted. Trees burst into flames, the blaze racing through the branches and spreading out in all directions. The underbrush smoldered, smoked, and ignited; and a wall of fire swept across the planet's surface.
The inferno consumed everything in its path.
Heat and fire. There was nothing else in Bane's world. It was as if he had become the storm itself: he could see the world before him, swallowed up in red and orange and reduced in seconds to ash and embers by the unchained fury of the dark side.
It was glorious. And then suddenly it was gone.
There was a jarring thump as his body dropped from where it had been hovering five meters above the ground. For several seconds he was completely disoriented, unable to figure out what happened. Then he understood: the connection had been broken.
He rose to his feet slowly, uncertain of his balance. All around him were the forms of the Sith, no longer kneeling in meditation but collapsed or rolling on the ground, their minds reeling from the sudden end to the joining ritual. One by one they also regained their composure and stood, most looking as confused as Bane had been only seconds before.
Then he noticed Lord Kaan standing off to the side, over by the fliers.
"What happened?" Bane demanded angrily. "Why did you stop?"
"Your plan worked," Kaan replied curtly. "The forest is destroyed, the Jedi have fled to open ground. They are exposed, vulnerable. Now we go to finish them off."
Darth Bane: Path of Destruction
As you can clearly see, all the power of the Sith was channeled though a single vessel: Bane himself, and he could feel his strength skyrocketing as a result. However, what follows is more fun:
Bane reached inward to call upon the dark side, drawing it not only from himself but also from the orbalisks fastened to his chest and back. Feeling an incredible surge of power beyond any he had known before, he released it in a burst of energy. The hallucinations that had plagued his wounded mind ever since the detonation of the thought bomb vanished, instantly and utterly annihilated by his newfound power. He was stronger now than he ever had been, and he knew the visions of the dead Sith would haunt him no more.
Darth Bane: Rule of Two
So the power Bane gained from just two orbalisks is greater than the one he received from the combined power of the Brotherhood, which was enough to devastate the surface of a planet. Bane at this point is a legit planet-level being and probably in the same league as the likes of Darth Nihilus and Failkorion. He continues to grow further, however, by having the number of orbalisks latched onto his body increase to the hundreds (if only two could elevate him to planet levels, imagine what hundreds would do), and the surpassing his full body orbalisk armor in his base form as of Dynasty of Evil. At his peak, Bane is thus likely more powerful than Failkorion.
"Can you feel it?" he screamed, feeling as if the raw power of the Force roaring through him might rip his very flesh asunder. "Are you ready to kill a world?"
The storm rolled down from the plateau and rumbled across the forest. Hundreds of forks of searing lightning shot down from the sky - and the forest erupted. Trees burst into flames, the blaze racing through the branches and spreading out in all directions. The underbrush smoldered, smoked, and ignited; and a wall of fire swept across the planet's surface.
The inferno consumed everything in its path.
Darth Bane: Path of Destruction
https://static.comicvine.com/uploads/original/11128/111282615/6224561-bane+ritual+1.png
https://static.comicvine.com/uploads/original/11128/111282615/6224562-bane+ritual+2.png
https://static1.comicvine.com/uploads/original/11120/111205740/5207916-screen+shot+2016-05-14+at+4.49.37+pm.png
Here is the ritual itself from the novel. I will highlight every piece of text that indicates all the power of the Brotherhood was concentrated within Bane, as that becomes relevant in my next point:
He had discovered the ritual she spoke of while studying Revan's Holocron: a way to unite the minds and spirits of the Sith through a single vessel so their strength could be unleashed upon the physical world.
Kaan, Githany, and the rest of the Dark Lords had gathered atop a barren plateau overlooking the vast forests where Hoth and his army were hiding. They had come on their fliers: short-range, single-person, airborne vehicles front-mounted with heavy blaster guns. The fliers were parked at the edge of the plateau, fifty meters away from where the Sith sat in a loose circle. The ritual had begun.
They were communing with the Force, all of them slipping into a meditative trance as one. Their minds drifted deeper and deeper into the well of power contained within each individual, drawing on their strength and combining it through a single conduit. Bane stood in the center of the circle, urging them on.
"Touch the dark side. The dark side is one. Indivisible."
The night sky filled with dark clouds and a fierce wind swirled across the plateau, tearing at the cloaks and capes of the Sith. The air shook with the thunder and crackle of a mounting electrical storm. Bolts of blue-white lightning arced through the air, and the temperature suddenly dropped.
"Give yourself over to the dark side. Let it surround you. Engulf you. Devour you."
The Brotherhood slipped deeper into the collective trance, barely even aware of the storm now raging about their physical selves. Bane stood at the eye of the storm, drawing the bolts of lightning into himself, feeding on them. He felt his strength surge as he channeled and focused the dark side from the others.
This is how it should be! All the power of the Brotherhood in one body! The only way to unleash the full potential of the dark side!
"Do you feel invincible? Invulnerable? Immortal?"
He had to shout to be heard above the howling wind and thunder. A web of lightning spiraled out from his body, connecting him to each of the other Sith. He shivered then suddenly went stiff, arms spread out at his sides. Slowly, his rigid body began to rise into the air.
"Can you feel it?" he screamed, feeling as if the raw power of the Force roaring through him might rip his very flesh asunder. "Are you ready to kill a world?"
There was very little in the galaxy that could scare a man like General Hoth. Yet as he sat looking over the latest situational reports from his scouts he felt the first glimmers of real fear gnawing away at the base of his skull.
The rift between himself and Farfalla had been mended, but now there was no way to get the reinforcements down to Ruusan's surface. Small messenger ships with a crew of one or two had been able to slip past the Sith blockade undetected, though on occasion even these vessels had been spotted and destroyed. Anything larger would never make it.
But his fear was more than the result of his frustration at having help so near yet so impossibly far away. There was something sinister in the air. Something evil.
Suddenly an image leapt unbidden to his mind: a premonition of death and destruction. He sprang to his feet and ran from his tent. Even though it was the middle of the night, he was only mildly surprised to see that most of the rest of the camp was up and about. They had felt it, too. Something coming for them. Coming fast.
They were looking to him for leadership, waiting for him to take command. He did so with a single, shouted order.
"Run!"
The storm rolled down from the plateau and rumbled across the forest. Hundreds of forks of searing lightning shot down from the sky-and the forest erupted. Trees burst into flames, the blaze racing through the branches and spreading out in all directions. The underbrush smoldered, smoked, and ignited; and a wall of fire swept across the planet's surface.
The inferno consumed everything in its path.
Heat and fire. There was nothing else in Bane's world. It was as if he had become the storm itself: he could see the world before him, swallowed up in red and orange and reduced in seconds to ash and embers by the unchained fury of the dark side.
It was glorious. And then suddenly it was gone.
There was a jarring thump as his body dropped from where it had been hovering five meters above the ground. For several seconds he was completely disoriented, unable to figure out what happened. Then he understood: the connection had been broken.
He rose to his feet slowly, uncertain of his balance. All around him were the forms of the Sith, no longer kneeling in meditation but collapsed or rolling on the ground, their minds reeling from the sudden end to the joining ritual. One by one they also regained their composure and stood, most looking as confused as Bane had been only seconds before.
Then he noticed Lord Kaan standing off to the side, over by the fliers.
"What happened?" Bane demanded angrily. "Why did you stop?"
"Your plan worked," Kaan replied curtly. "The forest is destroyed, the Jedi have fled to open ground. They are exposed, vulnerable. Now we go to finish them off."
Darth Bane: Path of Destruction
As you can clearly see, all the power of the Sith was channeled though a single vessel: Bane himself, and he could feel his strength skyrocketing as a result. However, what follows is more fun:
Bane reached inward to call upon the dark side, drawing it not only from himself but also from the orbalisks fastened to his chest and back. Feeling an incredible surge of power beyond any he had known before, he released it in a burst of energy. The hallucinations that had plagued his wounded mind ever since the detonation of the thought bomb vanished, instantly and utterly annihilated by his newfound power. He was stronger now than he ever had been, and he knew the visions of the dead Sith would haunt him no more.
Darth Bane: Rule of Two
So the power Bane gained from just two orbalisks is greater than the one he received from the combined power of the Brotherhood, which was enough to devastate the surface of a planet. Bane at this point is a legit planet-level being and probably in the same league as the likes of Darth Nihilus and Failkorion. He continues to grow further, however, by having the number of orbalisks latched onto his body increase to the hundreds (if only two could elevate him to planet levels, imagine what hundreds would do), and the surpassing his full body orbalisk armor in his base form as of Dynasty of Evil. At his peak, Bane is thus likely more powerful than Failkorion.
