So i started with a Doran's Ring, the mp5 and the ability power is a great start to Janna's Harass. You shouldnt have to go back to base till around level 6 if you play right and place Clarity where its needed. After that I build my boots of speed and turned them into Ioiands boots, the cool down reduction is nice, since all her moves have around a 5 sec cool down. After that I build a Megai's soul stealer for the stacks of AP( Helps Tons) than I go right into Lich Bane A: for the movement speed, B: for the 100% ability power to auto attacks( this puts the last touch on a kill usually). After that I go straight into a Rabadons for the ability power obv. Next I get the WIll of the Ancients for the support side the +30 ability power to the team is a BIG, HELP! Lastly I get a Void Staff For the magic pen.

First off, I know Janna is support, But with a little bend and twist, she can do massive damage/heal/slow/shoot in the air in team fights. Read my Build and try it before you say its dumb or anything. On some of the items your going to be like wtf??

Now to start off I usually got with a Tanky Champ, not to support but so they can take hits for you, First blood if played right should come around 5min in your lane, I wouldnt go Janna Mid shes really weak at the start and your Howling Gate has to hit to do damage. So the start should just be farming and going for kills to help your laning partner. You might end up with assists at the start, thats ok, your also a support so assist make the other team think you cant hold your own.

Alright so mid game you should have your lich bane and some AP so your W should nail them, you should be working rabadons, and if played right your Q and W can hit the same person, I took Half of Ashes Health like this before she even touched me. Your main focus for kills are Very Squishy Champs. If you come across a team fight pop your Q hit somebody With W and shield anybody whos low, IF your about to lose a strong person on your team pop that sexy ult to heal every one, when they run W somebody so your team can eat them.

Jannas Got total Power, Massive Get aways, Massive Damage, Sexy heals ect, this is where all your kills come, you can solo squishy champs and your build should be coming to a close. You can chase down low level champs, and your support should by far be amazig for the team. you can back door really good and save team mates and your self ( cuz shes so fast)

Pros

1. Fast Movement
2. Shield
3. Heal
4. Knock up.
5. Slow.
CONS
1. Weak start
2.Targeted alot
3. Cant solo till late late game.

THanks for looking at my Build Rate/ comment what i need to change, what could make it better ECT. All help is welcome but Nothing rude, i tried hard on this build and I wont listen to you if you attack me with rudeness Thnaks again, Oh and have a good day :D