Dianna is a very strong champion. She can burst down almost any carry if they are not careful. This champion is better off jungling than laning. You need the extra mana from blue buff. I will later in the future I will give my item build for laning, but right now I just don't like laning with Dianna.

VERY BASIC GUIDE, NO NEED FOR ANY FANCY SMANCY GUIDE.

Pro:
Fast jungler
Nice sustain
Too stronk
Cons:
Will be targeted first
Relies on mana

Explain why these runes for Dianna is great.

You get attack speed marks because you will need the attack speed for more of your passive during early jungle phase. Your passive is pretty strong if you did not notice that.

Armour Seals because you need to sustain in jungle. =_=

AP Gylph and Quits because YOU NEED MORE DAMAGE for early jungling and ganking.

Why no magic pen marks?
Because your shoes will give you it.
Seals
Don't ask me
Glyphs
more power
Quit
more power

I want to give a long explanation because all you need to know are these.

Here will be the reasons why I chose what I chose.
Starting with boots will help Dianna travel around jungle faster. Dianna needs to get to level 6 to be able to make more successful ganks.

The philosopher stone is because after your blue buff or red buff is gone, you would need more mana regen items. Philo would be perfect because it gives more money, and give you the mana regen you need.

Kage's lucky pick is for the extra gold and is to build your DFG. EXTRA BURST!

I go for either items that builds the death cap next. You want to deal more damage at this stage. Death cap is a good choice because it is one of the top tier ap items in the game.

What I build next is a DFG! This item will help you destroy whether your in team fights or you just want to camp a lane. Use this item ALWAYS!

Lich bane after this would just give your regular attack so much damage. That's why I would recommend it. However if your enemy is starting to build Magic Resist. Get a void staff by swapping out either rylai's or lich bane.

Rylai's after this will help you get extra tanky, and gives you the slow effect. Helps a lot if you suck at using your Q. lol

Last item just depends on your preference during that game. I build a hour glass during this time because you will need that extra tankiness and gives more AP. However, if you feel as the 2 second god mode from the hour glass isn't working out in team fights, build a Gaurdian's Angel. Gives you two lives.

Start out with wolves, when you see it spawn, use your W for the shield and damage.
After that go to blue, get your mid to leash it. The big golem should be walking to try to catch your mid. WAIT TILL THE BLUE COMES BACK AND ATTACK YOU. USE YOUR "W" then. If you use your W early, your going to take more damage.
Next go to wraiths> red/golem> red/golem > GANK IF YOU SEE A OPPORTUNITY.
Remember when you get Q, try to remember to use Q on the jungle spawn before you get there because it gives more damage output. REMEMBER TO BUY WARDS. YOU DO NOT WANT TO BE COUNTER JUNGLED. GET YOUR OTHER LANES TO GANK THE COUNTER JUNGLER IF THEY INVADE YOUR JUNGLE.

I have tested my own build so much times that when I lose it's not even my fault. My Dianna's score is usually more than half of the team's kills. Assist + Kill
FIRST TIME MAKING A GUIDE . I DON'T CARE IF IT SUCK. I'M JUST LAZY. WILL EDIT THIS GUIDE WHEN I FEEL LIKE IT. I'LL MAKE IT FANCY LATER...