Nephthys
The Gr8est!!!!!!!!
Most of his best feats come from the novels. Such as:
'Another Rodian came running up the corridor behind him, firing at his back. He deflected the shots with his lightsaber and brought the ceiling down on the raider, effectively sealing himself into the hyperdrive access room. No matter. The walls were- weak with metal fatigue. He could punch out in an instant when he was finished.
Kneeling in front of the turbines, he took a handful of cables in both hands and called on the Force. Energy surged through him, making him stiffen. Sith lightning sparked from his skin and snaked through the ragged metal walls, floor, and ceiling. Distantly he heard screams as the many beings inside the wrecked corvette suffered from the aftereffects. He ignored them, along with the smell of smoke rising from his own tattered uniform.
Focus, he told himself. Undirected power was power wasted. Gritting his teeth, he gathered the energy and directed it down his arms, into his hands. Blue light strobed across his vision as the lightning flowed into the wires and from there into the hyperdrive mi bines. Groaning, then shrieking, the massive engine came alive. Damaged, completely out of alignment, and barely controllable, the turbine shook with propulsive power, then strained against the braces still holding it to the corvette's warped chassis.
The deck kicked underneath the apprentice. He swayed as the entire corvette shifted. With a terrible sound, it began to move, plowing a brutal furrow through the surrounding rubbish. He could picture it clearly in his imagination and through the vibrant flow of the Force. As lightning poured through him and into the engine, it pushed the stricken corvette physically out of his path. I he way to the Temple was now clear.
When he sensed that it had gone far enough, he relaxed his concentration. Smaller discharges of energy skittered across his skin. Somewhat shakily, he stood, then almost toppled over as the engine continued to fire, sending the corvette onward, out of his Control.
He hadn't expected that. There was enough residual potential in the turbine to keep it running for dozens of seconds. He had to get out of the corvette before it dragged him any farther from his goal.
Straining, he blew a hole in the side of the downed ship wide enough for a TIE fighter to pass through. The wall of a junk canyon was gliding by, raining rubbish. With one smooth leap, he caught hold of dangling cable and swung free of the wreck. It roared on, dragging itself through the dregs of the galaxy on its disintegrating belly, sending waves of disturbed filth radiating out ward from its path.'
'Soon the foyer was full of the twitching, smoking bodies of the temple's hapless guardians. He began to tire, not from exertion but from the tedium of knocking down droid after droid, to no apparent end. There might have been thousands of them.
Deactivating his lightsaber, he took a deep breath. With one mighty exhalation of power, he blasted all of them-those in pieces and those approaching with needle-tipped fingers and vibrosaws upraised-out of the foyer doors. Then he blasted the rubbish piles after them. He kept pushing until a dark cloud toured out over Raxus Prime's hideous landscape-an artificial hurricane full of droid golems.'
'Automated weapons emplacements spotted him instantly. Red weapons fire stitched lines of explosions across the station's patchwork hull as he ducked between the AT-AT's massive legs. Scooping up components from the nearest construction conveyor belt, he threw a series of high-speed missiles at the turrets, knocking five out of commission. A stream of Sith lightning put the AT-AT itself out of action, and a good, solid shove tipped it over with a crash, providing cover for the Wookiees when the time came to cross.
The quartet had already started firing at stormtroopers converging on the scene. A furious exchange of blasterfire painted the air thick with energy. The apprentice deflected anything headed his way as he hacked into the side of the AT-AT and dropped into its munitions bay. The crew within was no threat, killed by the lightning, but he was careful not to knock any of the charges in case their contents had become unstable. He didn't want it to blow up just yet.'
'With one powerful release of kinetic energy, he exploded tin bull rancor's head from within.'
In the novel he also destroys the Skyhook (you know, the thing that goes to orbit) with the Force, basically forcequaking it to pieces, casually considers destroying Kazdan Paradus' Junk Jedi Temple with a Force Push and in the description of the Star Destroyer scene its mentioned that he's actually denting the hull and moving it about.
Also calling him a weak duelist is laughable, given that the first games database claims that his lightsaber skills are 'almost perfect.'