Hello and welcome to my in-depth Lux guide!
I'm a fellow Ahri main who decided to pick up Lux. After a while I chose to pick up Lux as my main - and now I'm playing her only!

I apologize about some mistakes in my sentences - English isn't my first language and I'll write a lot.. so I can't read every mistake yet!

This guide is still a WIP [Work in progess] - I'll update it as soon as I can to make it better!

Before you start a game, you should choose the right set-up. Here I'm discussing Lux' runes.

Classic Rune page (tl;dr)

9 Magic Penetration Marks
9 HP per level Seals
9 CDR per level Glyphs
1 CDR per level Quint
2 flat AP Quints

Marks
You want to take Magic Penetration in every game. These Marks are always taken on mages on the mid lane. Magic Penetration ignores an amount of Magic resist so you'll deal more damage.

But why do you take 3 Attack Speed Marks aswell?
I take them to CS better under the turret. I did this on Ahri when I mained her and it was confortable on Lux - so I kept it. When you Autoattack the minion before a turretshot goes thru, you can Autoattack again and get the creep.

Seals
HP per level is also pretty standard for mages on the middle lane. Because you won't build that much resistances (or any at all) you need a bit more HP to survive early and mid game. You are not taking flat HP because it scaling HP outscales it at level 6-7.

Glyphs
Cooldown reduction is very mandatory on Lux. If possible you want to get 40/45% CDR as fast as possible. You'll get 20% CDR with Morellonomicon, so you're missing 20%. Together with the one CDR/level Quint and the 9 CDR/level Glyphs, you'll get 40% without outcapping.
If you know in the champ select that you'll build Banshee's Veil or Zhonya's Hourglass, just take 10% scaling CDR. The other 3 Glyphs will be then either flat AP, scaling AP or scaling MR - just take what you want more.

Quintessences
The 2 (3) flat AP is also the standard on every mage. Like I said before in the Glyph chapter, you want sometimes want to switch out the one CDR/level Glyph and take flat AP instead.

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Rune Page vs AD (tl;dr)

9 Magic Penetration Marks
9 flat Armor Seals
6 CDR per level Glyphs
3 flat AP Glyphs
3 flat AP Quints

Seals
It's self-explanatory. You need Armor because the enemy opponent builds Armor.

Glyphs
You only need 10% CDR/level because with Morellos and Zhonya's you'll reach the cap of 40%. The 3 flat AP Glyphs are here for more DMG - and you won't need MR in this Match-up. Flat AP are the Glyphs who brings the most AP for it's category. You can also take scaling AP, but I'm more a fan of flat AP for early trades.

Marks and Quintessences are also self-explanatory.

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Rune Page vs light AP (tl;dr)

9 Magic Penetration Marks
9 HP per level Seals
6 CDR per level Glyphs
3 scaling MR Glyphs
3 flat AP Quints

I call this page "vs light AP" because I pick this rune page when I'll build Banshee's. This will be mostly against Assassins like LeBlanc or Kassadin - but also against Karma and some other Mages. I might add later match-up tips against every other midlaner!

I won't go any deep into each rune type due the similarity of this rune page and the Standard one. Basicly it's just instead of 20% CDR/level just 10% CDR/level. You just want to switch 3 CDR/level to either flat MR, flat AP, scaling MR or scaling AP. It's up to you. I prefer taking scaling MR for a little more MR in mid to late game.

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Rune Page vs heavy AP (tl;dr)

9 Magic Penetration Marks
9 flat Health
9 flat MR
3 flat AP Quints

This is a rune page I take against treats like Syndra, Katarina and some other champions. Your goal as Lux is in those matchups to survive - and not to die, especially pre6. That's why you want to take flat MR in the Glyphs and flat Health in the Seals. You will NOT have any CDR in your runes, so you either get 24/7 your blue buff or you build Banshee's at least as an 3rd item (against Syndra even earlier).

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Special Runes

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Frostqueens Claim build - FQC (tl;dr)

9 Magic Penetration Marks
9 HP per level Seals
9 CDR per level Glyphs
3 CDR per level Quints

This build should be build when you are more comfortable with Lux and her Manaconsume. You also want to reach 40/45% CDR as soon as possible. FQC gives you 10% CDR. The other 30% CDR are only avaiable with runes. That's why you want to take the scaling CDR in both - Glyphs and Quints. More about this build in the Build section.

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Standard rune page for any AP caster (tl;dr)

9 Magic Penetration Marks
9 flat Armor Seals
9 flat MR Glyphs
3 flat AP Quints

When you only have 2 rune pages avaiable, you can consider taking this rune page. Riot reduced the price of these runes a while ago. So everyone can get these runes quite easy.

This runepage can also be used when you blind pick into somebody, but you don't know who you'll play against. It has everything you actually need - Armor against AD match-ups and/or Autoattacks; MR against AP match-ups; AP for DMG.

W I P !

W I P !

W I P !