iwillblessu: Actually I didn't know you guys could already see the guide.. I just pressed the wrong button i gues...

Killdemnigs: As I sayed, you exceed the CDR cap with Morellos, the extra 2 MP5 and 15AP on it are useless compared to the active of deathfire grasp!

Flamecrash: Actually I'm not that sure about leaving the Deathcap in the build at all ;) But anyway, what makes a support?
- He buys wards
- He keeps others alive
-> more shield with more AP.

RosePhoenix: Buy wards all time + Buy blue potion all time.. Have fun finishing any items :(

CasterMaster: I'll add that solaris item and some other, as that isn't finished yet ;) I just had only once the chance to try it so far (and this in a pretty bad game...)
About Randuin's: If you want to use the active in a sensible way, you will have to run into the middle of the teamfight... You aren't supposed to be there^^

Pretty much what RosePhoenix said. A support champion needs support items, runes, and masteries. A good suggested build for a support Orianna could be Ionian Boots of Lucidity, Shurelya's Battlesong, Randuin's Omen, Abyssal Mask, and Locket of the Iron Solari or etc etc.

No reason ever to go AP on a support. Orianna is geared towards an AP carry with utility. If you're going to play her as a support you probably should buy support items on her.

Also, with your reasons-not-to-buy-Morello's, buying Blue pots also reduces CDR.

So Rylai , Deathcap , Rod of Ages , Will of The Ancient and boots - 5 mage items - so i dont get why is this not a caster guide , just take moreloo and boots with magic pen and its all mage . Oh ye you need the 6'th slot for wards :P So its mage with wards :D
So as for the support boots , normally on support they use cd boots if they have great cd-s on heal or so , i think on oriana for just one shield (ye and the rest , but mainly is the shield in fight , the slow is for engage or catching up ) , still the points is for a support use a mage boots or tank ones - armor or magic ressist . If you dont plan engaging in combat even the out of combat speed boots are great .

Still the guide is not that bad , have some nice info for the players wanting to play this hero , i think its useful :)

Oh and +1.

Is this a guide in progress? Anyways you raised some good points but only thing is Morello's Evil Tome should be in the do's. Its great for ability cooldowns plus it gives a bit of ap as well as MP.

uhhh idk if you publisehd too early cuz u picked nothing for items or anything