Hello, and Welcome to my build for LEONA! i'll try to make it quick and plain, and easy to understand.
this is my first guide here on Mobafire, so i'm quite new to the stuff here, so sorry if everything's not perfect ;)

I have been playing Leona for quite some time now, and i think she's probably one of the funniest champs to play on LOL.
She is a really strong champ, if not THE strongest. She has a snare, two stuns, and a massive buff, which gives her 70 mr/armour at full rank, which is Really great to have.
Her stuns & root are, what makes her almost impossible to gank.
Overall, i think She's the best champ in lol!

Hope you enjoy!

I like to start out with boots, cause Leona has a quite slow base movement speed, and with the movement speed quintessences, it makes her fairly fast. Then, if i'm against an ap team, i imediately buy mercury's threads, and for ad, i take the ninja tabi.Then i take a bilgewater cutlass, just for the slow & lifesteal. And then, i usually take the wit's end, if i'm against ap, and the Wardens Mail, which both are really good on Leona. And then i take the Frozen Mallet, cause you gotta stick on to your targets, right? then i go for the BloodThirster, which adds on the DMG you have, and then i finish the Bilgewater Cutlass off with a Blade Of The Ruined King, which works really, really great on leona! and then, i end the build off with a Trinity Force, it's like made for leona!

for runes, i take 9 Greater mark of attack damage, cause she needs that damage, who doesn't?
and i take 9 Greater Seal's of Armour, cause together, which give 13 armour at level 1, which is alot! I also take 9 Greater Glyph's Of Magic Resist, in case you encounter some ap's.
and then, i take 2 Greater Quintessence Of ms, and one quintessence of armour. the ms is just great on leona, and is a need.

For masteries, i use 1/21/8, focusing mostly on tankyness, and taking a bit of utility as well.
This works the best for me, and i always use this setup for Leona.

pros
very tanky
disruptive in team fights
good chasing skills
low mana costs
overall good


cons
wait, there are cons? oh sh*t!
falls off late game
may be a bit low on dmg early

i tend to get max my ECLYPSE skill first, because in my opinion, it's the best to get, you get 70 mr/armour at approx level 8! And of course, i'm leveling my ult at level 6, 12 and 18. Then i max my Zenith Blade second, just for the cd, that is, and maxing my Shield Of Daybreaks last.

farming with Leona is pretty easy. All you have to do is use your Eclypse ability, stand ner minions and try to last hit. as easy as it gets!

leona usually doesn't make that much damage, but in this build, i just wanted to show that leona has so many possibilities than just a tank/support. You can play full ap with her, you can go full ad, or you can use this build!

Well, i guess this guide has reached it's end then. I hope you liked this guide,If you have questions, don't be afraid to ask into the comments section. :D