Lux

Strengths

Lux has great zone control abilities. Try to set up Lucent Singularity to prevent an enemy's advance or escape.
If you have trouble landing Prismatic Barrier, remember that it returns to you after it reaches max range. Try positioning yourself to hit your allies with its return trip.
Lucent Singularity is a great scouting tool. Try throwing it into brush before walking into it to check for ambushes.

Passive · Illumination — Lux's damaging spells charge the target with energy for a few seconds. Lux's next attack ignites the energy, dealing bonus magic damage (depending on Lux's level) to the target.
Q · Light Binding — Lux releases a sphere of light that binds and deals damage to up to two enemy units.
W · Prismatic Barrier — Lux throws her wand and bends the light around any friendly target it touches, protecting them from enemy damage.
E · Lucent Singularity — Fires an anomaly of twisted light to an area, which slows nearby enemies. Lux can detonate it to damage enemies in the area of effect.
Ultimate · Final Spark — After gathering energy, Lux fires a beam of light that deals damage to all targets in the area. In addition, triggers Lux's passive ability and refreshes the Illumination debuff duration.

A suggested 5-lane lineup built around Lux, based on hero partnerships and role synergy — not win rate.