So this is my first attempt at a build, and is very much a work in progress at the moment. so all advice and comments are welcome.

Through my limited experience with Morgana, i feel that her strengths lie in her abilities and not attack damage, and therefore this build focuses on mana regen and ability power. As many others have said, she is a great farmer and using her abilities (mainly tormented soul) to help her farm can improve her levelling up ability and make her a stronger champion, sooner.

All of the runes in this build focus on mana regen and ability for the simple reason that if you can farm more, you can gain mor XP and so level up.

I have tried to setup the mastery page in such a way that it exploits her abilities and mana regen and cooldowns so you can use her awesome abilities more often. i have also given her some quickness to help in those sticky, "run and heal" situations.

Items to purchase again exploit mana regen and ability power, in order to gain the max benefit from her shackles and tormented soul.

My favourite combo on an enemy champion: Ignite -> Dark Binding -> Tormented Soul -> Shackles
Its always good to have a friend with a slow spell nearby so your enemy can't run too fast.

So far, i have found that this build is a great support build and works really well with a tank at your side.

I hope you enjoy playing it as much as i do