hello, and welcome to my build of Leona. I play Leona as an tank with lots of armor and MR.
that's why i chose health runes. I like Leona because she has good abilities and you can save your teammates in almost every situwation with your E spell and then your Q skill. please read and try before voting. thank you! SORRY FOR BAD ENGLISH SOMETIMES IN MY BUILD DON'T DOWNVOTE ME FOR THAT PLEASE.

Runes

Masteries

Items

Summoner spells

PROS & CONS

For Runes I take flat health dodge chance and cooldown reduction. I take cooldown reduction because i dont have any item of that in my build. health is for that little bit of extra defense. it are very good runes for a tank. dodge chance runes are good against everyone and you need these runes to protect you against too much health loss.

for masteries i take 1/21/8. that one in attack is for exhaust. 21 in defense are because Leona ís a tank and that are very good tank masteries. i take 8 in utility to fasten leveling up, quicker spawning and health and mana regeneration. these masteries are very good at Leona and she can do lots of damage with her spells what is amazing! I think she gets nerfed on that one and mana cost.

for items I choose armor and MR in stead of health cause health will only melt away with no armor and MR. so that's why i have less health and more defense items. at the end you are almost undieable. I take doran's shield first to stay in lane and be tanky at the beginning.
you can buy boots of swiftness in stead of mercury's treads and you can do force of nature earlier if you play against mages.

For summoner spells i choose exhaust & flash. exhaust gives very much possibilities atacking, or defending. flash gives also very many possibilities cause you can flash over walls and such things. I use exhaust probably always with a teamfight or to escape. sometimes, I flash over walls if i hunt someone down, use E, Zenith Blade, to go to him and shield of daybreak to stun him and finish it of. you can best do W,Q,E for the best damage output cause you charge your shield with 3 seconds cooldown before it explodes. in that time you use Q to let your next attack stun. and then you pull yourself to the champion with E. your shield will explode and you stun him if you have your ulti you can do that too to stun him another time.

PROS

good in hunting down enemies

very well assasin with zenith blade

good turret diving with eclipse

well in teamfights

can protect allies

CONS

not very good at First Blood

not very much damage output

slow

very easy to kill if you if your enemies have slow like frozen mallet or rylai's

zenith blade animation not very good.