Lux is a AP mage caster who can also be played as a support. Lux has a good long range poke, with her E skill, and when combined with the ultimate and Q spell, it is unbeatable. In your cast sequence, you should firstly try to snare them with your Q spell, then go with your E spell and if you think you can kill them, then finish off with your ultimate. The W skill can be used to shield Lux or her allies, it acts as a boomerang, so you would get two shields, the shield is pretty strong, since it gives you two initial shields. In the early game, you can harass with Lux's passive, which does quite a bit of damage early game. Lux's initial burst is pretty good once you farm enough AP, by using this cast sequence you can obliterate the other champion!