Great guide, I was amazed how good he is because I played with him before his nerf and so I took Graves which I refunded just to buy Xerath, and I belive it payed off!
+1 from me

Sorry for writing that so brash. Let me expand.

Rylai's slow on AoE spells is only 15%, that means that your Q and R will give a 15% slow (half of frozen mallet/red slow) - and that slow is shorter than the cooldown on your spells, so it wont really let you hit them. You will get the 35% slow on your E but by the time your stun is over, so is that slow. It's pretty counter-productive. Xerath is one champion that can consider building without any health since he is so high range.

Then on the Athene's post - I'm not against it, but like you said it's situational. Thanks for the response.

Not gonna say you're wrong about the Doran's Ring thing but you should try it out after you get your Boots + 3 Potions. Someone did the math on Reddit and Doran's Ring gives 816 gold worth of stats. Very good item.

@ Ryan
I never liked Doran's at all, I don't see where Rylai's is a waste on a skillshot Champ and if you would have read my guide you would see my item section witch CORE (included in the cheat sheet) and OPTIONAL to fill your items corresponding to the current game. And I did include a note for Athene's, however I will think about it again!

Never rush Sorc Shoes before any Doran's Rings. Rylai's on Xerath is a waste of good gold, and Athene's Unholy Grail is only for cases where you cannot get blue buffs. Your item build is not even 6 items. Please consider finishing guides before pressing publish.

I was thinking about the AP/level runes and will try it out once I got the money for it D:
Anyways, thank for your feedback guys!

Looks good, but you should switch out Greater Glyph of Ability Power for Greater Glyph of Scaling Ability Power because it only takes 5 levels for Greater Glyph of Scaling Ability Power to outscale Greater Glyph of Ability Power.

Good luck man =)