This lore is out-dated and is no longer considered canon.
In a world far away where an ancient war still rages, Kayle was a great heroine - the strongest of an immortal race committed to destroying evil wherever it could be found. For ten thousand years, Kayle fought tirelessly for her people, wielding her flaming sword forged before time itself. She shielded her delicate features beneath her enchanted armor, the sole remaining masterpiece of an extinct race of craftsmen. Though a beautiful, striking creature, Kayle, now as then, avoids showing her face; war has taken a terrible toll upon her spirit. In her quest for victory, she sometimes would try to lift the wicked up from their morass of evil, but more than often she instead purged those she herself deemed beyond redemption. To Kayle, justice can so often be an ugly thing.
Ten years ago, Kayle's war against evil was nearly won... until her rebellious sister Morgana, a pariah amongst their people, suddenly gained powerful new allies: magicians of a hitherto unknown world called Runeterra. Morgana traded servitude to a number of the summoners in Runeterra's League of Legends for powerful new abilities that, if mastered, threatened to bring Kayle and her people to their knees. To save her world, Kayle had no choice but to make a pact with the League herself. She approached the leader of the League, High Counselor Reginald Ashram, with a deal of her own. In exchange for a thousand years of Kayle's service, Ashram halted all League interference on Kayle's world. With Ashram's disappearance five years ago, Kayle has new causes on Valoran: find out who or what caused Ashram to disappear, defeat her sister Morgana upon the Fields of Justice, and bring her own brand of justice to the League of Legends.
"In the League of Legends, Justice comes on swift wings."
"Into the fray!"
"Lead me to battle."
"Into the fray!"
"Your time has come."
"An eye for an eye."
"Come here! I'll teach you all about the afterlife."
Kayle throws her sword into the ground and balances on its hilt with one foot.
"Are... You sure you're not in the wrong league?"
"Ugh, dust in the clockwork."
"Let my blade speak the law!"
"To rebuild we must first destroy."
"Faith and steel unbroken."
"There will be no compromise."
"This is for the greater good."
"By wing and blade."
"Order, through time and space."
"A future forged in light and steel."
"Everything in its place."
"I bring a vision of utopia."
"Perfection unto eternity."
"Trust in my vision."
"Prosperity through technology."
"The whole world in our image."
"Nothing left in flux."
"Crafted in divine light."
"I see into infinity."
"In time, all will understand."
Kayle's wings malfunction and she falls to the ground.
"What? No! Ugh... Hmm. Sometimes you just need to reboot the system."
"Uh, malfunction? What I... Uh, I mean... That was all part of the grand plan!"
"Uh, oh, ah, wha- wait. See? Perfection."
"So long as I have my wings, you will always stand in my shadow."
"The future is perfection. It's a pity you will not live to see it."
Riot Kayle concept art (by Riot Artist Brandon Liao)
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Eye for an Eye (Active): For the next few seconds, all damage that Kayle takes is reciprocated in an area of effect around her, dealing damage. (Alpha Week 2–V0.9.22.16)
Vengeance (Passive): Kayle and nearby allied champions gain additional attack speed. If an allied champion dies while under the effects, Kayle's attack speed is further increased as she attempts to avenge them. (V0.9.25.24–V0.9.25.34)
Holy Fervor (Passive): When Kayle kills an enemy champion or an allied champion dies near her, she goes into a state of Holy Fervor, increasing her attack speed by 25%. This effect can stack 4 times. (V188.8.131.52–V184.108.40.206)
Holy Fervor (Passive): 30% of Kayle's attack damage is added to her ability power and 15% of her ability power is added to her attack damage. (V220.127.116.11–V18.104.22.168)