Relic of the Future: Chapter 29, Chapter 44, Chapter 67, Chapter 87, Chapter 88, Chapter 147

"Poison gas," she said. "We could have used smoke bombs or some kind of gas to knock you out or weaken you enough to have a chance."

Qrow gaped at her. "What?"

"Ah, well, I suppose." Taiyang stammered. "It wasn't what I was going for, though. How about you, Sky?"

"A hidden Tazer. Aura only protects if you're aware of the danger, and some things – like electricity – can bypass aura entirely."

—Relic of the Future: Chapter 29



"Whitley, help! He's here!"

A bullet pinged off his shoulder, sending sparks shooting down his arm. His hand twitched and he almost dropped his weapon. Before he could fire again, however, Jaune grabbed Weiss around the shoulders and hauled her up in front of him.

—Relic of the Future: Chapter 44



Jaune backpedalled.

The battlefield held no objective he needed to fight over, so ground was given easily. He kept his eyes locked onto Hazel's, ducking beneath one mighty fist and bringing the flat of Crocea Mors up for the second. He didn't block – doing so against Hazel was a terrible idea, as Ren had once learned. Instead, he deflected to the side, diverting the force away and taking only a small crackle of electric into his arms. His nerves burned and his muscles tensed.

—Relic of the Future: Chapter 67



Amber followed the sound with her attack, slamming her howling gale into his weapon and cracking it against the wall. Had her attacks been quieter or had she waited, she might have heard his footsteps, but wind and lightning were by their very nature loud attacks. His footsteps went unnoticed, coming in closer in the dark.

It was the reflection of light on his sword that clued her in. The brief glimmer he couldn't avoid. Her hand shifted to face him, energy swirling around it. He cut down toward it, aiming if not to sever her fingers, then at least deflect the attack away. At the same time, he shifted right, ready to abandon the assault and get out the way of whatever came.

Lightning. Shit. Aura or not, however many volts entering your system could still be an impediment, if not fatal. Twisting on his heel, he pivoted just enough to get out the way. His skin burned from the stream of lightning pulsing only a few inches by. Electricity jumped, his tired mind warned, but whether it was that this was controlled or just a facet of her power, it didn't cross the tiny gap to strike him.

—Relic of the Future: Chapter 87



Fighting through the storm, Jaune pushed past the final barrier and into Amber's guard. Her eyes were wild, wide and afraid. Seeing him, she brought both hands down and summoned a crackling ball of lightning.

I came back to change the future.

The lightning shot forth.

But I guess her fate is going to be the same either way.

Roaring her name, he took the attack head-on, surging through as electricity crackled and sparked all over his body. Aura tanked, pouring off him in steam as it fought the lightning. Memorising her last position, he clenched his eyes shut and fought past the locking of his muscles. He charged up the steps, knowing she had no room to float up or away. Pushing off the last step, he vaulted onto the pedestal with the book, then jumped higher still.

They collided in the air, Amber unable to escape in the confined space.

—Relic of the Future: Chapter 88



The woman made her first sound of the fight, a smug "Hmph" before she flung her hand down and toward Harriet.

Thunder cracked.

Lightning did, too, but it was the thunder that rang in her ears as she was flung backward. Light travelled faster than sound, explaining why she heard the strike after she felt it. If it weren't for her aura, she'd be dead. Instantly. As it was, she was flung back and into a tree, smacking into it with enough force to shatter the trunk and topple it backward.

The world went black.

[...]

"James, you have to hear this." Jaune said. The look on his face made the severity clear and he nodded for the man to continue. "Harriet, tell us what you saw about the person who beat you. Slowly. Don't rush it if it hurts."

"I-I'm fine," she stammered. "T-The shakes are, ugh, nerves a-are rattled. Electricity." Closing her eyes, she grit her teeth and forced herself to be still. It seemed to work because her words came out clearer, if slowly delivered. "It was a woman. Weather control. I thought it was wind at first, it was all she used, but then she made the clouds themselves gather and summoned a lightning strike. I-I couldn't dodge it. Never even saw it coming."

"You're fast, Specialist, but not faster than light." Ironwood touched her arm.

[...]

Her injuries were mostly superficial thanks to her aura.

"I gave her some of my aura to speed up the healing process," Jaune said. "As best I can tell, she'll be back to full shape in no time. Probably a few days off to get herself in order."

—Relic of the Future: Chapter 147