Why did I write this Guide and what is it about?

Because it's just awesome to be overpowered and to hear "thx for saving my life" and "omg nice lux, gj" all day. This guide is about Lux and how to be the best damage dealing, the best life saving and the brightest shining char around.

Why did I choose those Runes?

I picked Greater Mark of Insight because it's pretty effective on everybody. Magic penetration is great for nearly every mage char in the game.

Greater Seal of Replenishment is good to not run out of mana that fast in the early game. Lux's Lucent Singularity costs lots of mana and it's the most important move so we need the extra mana regeneration.

I like Greater Glyph of Potency because together with Greater Quintessence of Potency we got ~24 AP at level 1. It's not just good for our early farming, it's also good for pushing your enemy and maybe getting firsblood.

Pros:

-> dealing lots of damage
-> you can slow/stop your enemies
-> gigantic range with her ulti ;)
-> you can use Prismatic Barrier to protect your teammates
-> you can use Lucent Singularity to look what's inside of the bush ;)

Cons:

-> low life
-> her abilities are hard to aim
-> when out of mana she can't do anything...
-> pretty high mana costs on her abilities