I don't see why her lightning would be any different that any other force user, i,e being of properties than can be absorbed by a saber. She doesn't have any fears to my knowledge of being a capable swordsmen, and while Tiin lacks dueling feats as well his accolade of being "best of the order" counts him as being more than competent. I realize his only combat is droid killing, but it makes it hard to argue anything to the contrary as Nyriss lacks saber feats similarly
She doesn't have any fears to my knowledge of being a capable swordsmen
"A burst of purple lightning arched down the steps, catching both men in the chest. They barely had time to scream before they were turned into charred and smoking husks...
She raised her free hand above her hand above her head and fired off another burst of lightning. Both Scourge and Meetra threw themselves clear of the deadly electrical bolt, but in doing so gave Nyriss the early advantage.
Before they could recover, she leapt at them. Despite her withered appearance, she moved with all the speed and ferocity of a dark side warrior in her prime. She landed right between the two adversaries, her blade flashing back and forth in a series of slashes and cuts that immediately threw her two opponents on the defensive.
Scourge barely managed to parry the first wave of her assault, unable to even thing about countering with an attack of his own. Another quick thrust foced him off balanced and he staggered backwards.
Nyriss seized on the opportunity to focus all her efforts on breaking through Meetra's defenses. The Jedi was clearly outmatched; though she managed to hold her ground, she was forced down on one knee.
In the awkward position her right flank was exposed, and Nyriss brought her blade in to deliver a crippling cut. At the same time, Scourge lashed out with the Force, catching Nyriss flush in the center of her chest.
An ordinary foe would have been thrown clear across the room, but Nyriss instinctively threw up a Force barrier to protect herself, absorbing and redirecting the brunt of the impact. Even so, Scourge's attack knocked her off balance just enough time to send her lightsaber wide of the mark, giving Meetra the opportunity she needed to scramble away to safety.
Scourge rushed forward, hoping to drive Nyriss back into a corner, but she mat his charge was an invisible wave of rippling energy. It picked Scourge and tossed him head-over-heals, sending him crashing into the wall.
Dazed, he looked up just in time to see another bolt of violet lightning to catch Meetra in the chest. Like Nyriss, she threw up a barrier to save herself from the worst of it, but she was still knocked from her feet.
'Did you think I would be as easy to defeat as Xedrix?' Nyriss shouted, raising her lightsaber triumphantly above her head.
The air around her began to crackle and grow hot as she gathered herself for the killing blow. Scourge felt the energy building inside her, and he knew he was powerless to stop it. Nyrisss was too powerful; her command of the dark side was too strong."
―Star Wars The Old Republic: Revan