Everything seems fine, I'm lvl 7 mastery Morgana supp main and I came up with a build like yours my own way. Somebody said that heavy AP is pointles on Morgana Support - I disagree. Morgana (at least at my level, wich is low gold) works perfectly well as constantly poking support, she also has great killing potential. Given that, rushing Morello (especially the Lost Chapter) usually benefits both bot and midlane, as roaming and landing a Q on enemy midlaner usually means a kill to your ally.
If my lane is hard, I focus on utility items, such as Redemption, but even then Lost Chapter and Morello in the future makes you a true threat to enemy team and doesn't make you useless in teamfights. Conclusion is, you can never have too much AP on Morg Supp - poke, harras, and thought that your Q could hit anytime and from anywhere makes the game really hard for opponents.

Sorry everyone took another one of those really long breaks from LoL and now i see that my guide here needs some serious revision.

To BoxerOce: The Deathcap AP bonus is of course from all AP you have at any given moment, i only advise to get it later because it scales of AP and has no other effect (unlike Zhonyas, Athenes, etc). Hope that helps.

To paul2752: I second that, gonna revisite the guide hopefuly in next couple days to adress all things that need to be changed.

I don't really see reason to get heavy AP item on Morg sup. She deals decent damage with just Frostqueen and Zhonya

She is not like soraka/nami/janna that can spam shiled on others; her CD of Black Shield is quite long compared to other itmes and I think you need to put utility itmes with CDR to protect AD or the assassin mid late game. In fact, 45% CDR is forced on her if her team's main damage is assassin like kat.

Hello Satzman666, General query and one I have had arguments with my friends about....
You say to get the Deathcap after some ability items so the 30% stacks as much as possible. I don't agree that the 30% increase in AP is only on items already bought when you get Deathcap, it is on all items you have? Value your comments.

Edited both biscuit issue and wrong ability leveling in support. Thanks for your comments

Umm the ability upgrade path has 1 to many upgrades in the e...

I have read all 3 new season guides and only one tell you to take secret stashas a support yet they tell you to take biscuits of rejuvention . Am I missing something or aren't biscuits only available with this mastery?

The slow works on her W and her ult, both of which makes good use of a slow letting the W do even more damage and the ult more likely to have its second activation.
You can also use the Rylai W to try and keep people in the ult with it as an aditional slow.

The reason I initially brought it up is because I managed to kite an entire team all the across the map just using her Q and W (with rylais) and it worked really well IMO.

Worth a try atleast

As slows no longer stack (you only apply the strongest slow), you shouldn't buy rylai's on morgana. You'd only be getting the slow on W, since your Q lasts so long that it fades out :P

Is there a reason not to use will of the ancients on morgana?
when used with soil you can heal a great deal without losing focus on your lane opponent, just soil minions and enjoy the hp, also, why no rod of aegis?

Returned to the guide after long time and edited it for season 5 ... with the kill potential i agree she does have a lot of damage especially mid-late game, but she is not the typical duelist and kill carry mid laner like LeBlanc or Zed. She does have some kill potential, but considering other champs she doesnt have as much as they do and compensates with her utility for that.

Good guide. There's only one thing I do not like here- Athene's Unholy Grail. If your opponent mid is hard AP, get Chalice of Harmony but why do you finish it when you have far better choices like Abyssal Mask or Liandry's Torment?

Plus, one of the cons says that she hasn't got a lot of kill potential. I think you are wrong. With that 4.5 sec snare+stun, and your high damage W...nooo. You can literally kill some ADC at about 80% HP with Q+W late.