UnuThul almost mentally dominating Luke, who beats it mainly through external support (credit to Urs for finding it):
Raynar's eyes grew very dark around the edges, and suddenly Luke could see nothing else. The murky presence began to reach into his mind, trying to push its way inside his thoughts to read his intentions. Luke was astonished by its power and had to reach deeply into the Force to bolster his own strength. Though the probe was hardly subtle or refined, it felt as though it were being driven by a thousand Raynars, and he feared for a moment that in his surprise he would be overwhelmed by its sheer might.
Then he felt Mara pouring her own strength into him, and Saba and even Leia. Together they pushed the dusky hand back. Luke found himself looking once again into the blue, lidless eyes of their host, and he finally began to comprehend just how difficult it was going to be to reach Raynar Thul.
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UnuThul bending turbolaser barrages:
A few moments later a turbolaser barrage streaked toward the frigate. A deep pang of sorrow washed over Leia as she awaited the coming explosion. Whatever Raynar had become among the Killiks, he had once been a Jedi and a close friend of her children, and she knew that his loss would leave her feeling empty and dismal._
Then, as the strike neared Raynar's vessel, the dark weight inside vanished, and Leia's strength surged back. Still gasping, she was about to report who was aboard, but the turbolaser barrage suddenly veered away and blossomed in empty space._
Grendyl cried out in astonishment, a murmur of disbelief rose from the survivors on the command deck, and Leia finally understood why the Killik gunners were such bad shots._
They weren't trying to hit the Ackbar._
When the second volley of turbolaser fire also veered away at the last instant, Bwua'tu narrowed his eyes and turned to Leia._
"What is it?" he asked. "Some sort of new shield?"_
Leia shook her head. "It's Raynar Thul," she said. "And I think he's coming to take your ship."_
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Size of the Colony in the trillions:
The Chiss would grow even bolder and attack deeper into Colony territory. Trillions of Killiks and millions of Chiss would die, and the war would continue more ferociously than before.
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In other words, UnuThul has:
[list]
[*]The best 1 v 1 TP feat in Star Wars
[*]The best environmental telekinesis feat in Star Wars
[*]The largest on-paper amp in Star Wars
[/list]