Lux is a support/mage character in League of Legends. She is very similar in play style to Morgana, the Fallen Angel.
The sister of the Demacian hero Garen, Lux's abilities were apparent from a young age. She could bend light with the power of magic, and at a young age she was taken in by the Demacian military who would help train her to use her powers for good. She wanted to live up to her legendary brother, and wouldn't let anything get in her way.
Passive: Lux's damaging spells charge the target with energy for six seconds. Lux's next normal attack will cause the target to take 20-190 additional magic damage, depending on Lux's level.
Active ability (Q): Lux fires a a sphere of light that deals 60/110/160/210/160 ( 0.7) magic damage and immobilizes the first target it hits for 2 seconds.However, this spell passes through targets and will hit up to a maximum of two. The second target will receive approximately half the damage done to the first enemy, and will be immobilized for 1 second.
Cost: 60/75/90/105/120 Mana
Active ability (W): Lux throws her wand and bends the light around any friendly target it touches, protecting them from 50/75/100/125/150 ( 0.3) enemy damage. Once the wand reaches its maximum distance it will return to shield any allied champions it touches.
Cost: 75 Mana at every level
Active ability (E):Fires an anomaly of light into an area, which slows all nearby enemies by 14/18.5/22/26/30% for a maximum of 5 seconds. Before this 5 seconds elapses, Lux can detonate the Lucent Singularity by pressing E to damage enemies in the area for 60/105/150/195/240 ( 0.6) magic damage.
Cost: 70/85/100/115/130 Mana
Active ability (R): After gathering energy, Lux fires a beam of light that deals 300/400/500 damage to all enemies it touches.
Cost: 100/150/200 Mana