I'd like to share of how I play my favourite champion Leona.
In my opinion, Leona is designed as a tanky supporter who dishes out heavy CC, so if you want be the stunnig beauty of bot lane this is the champion for you.Easy harrass since lvl 2 with zenith blade and Shield of Daybreak can be your carry pretty fed since the first minute of the game.
I apologize my english but I am not a native speaker and you will notice this, however, I hope everything is understandable.
AD = Attack Damage
AP = Ability Power
CC = Crowd Control
CDR = Cooldown Reduction
CV = Clairvoyance
HP = Hitpoints
MR = Magic Resistance
MS = Movementspeed
Runes are also player dependent.This is in my POV the best setup for her
Simply you are in bot lane so you will face ad carry, so you need armor
Gold per second 0.25g/10 sec
We want gold, we live for gold.We are playing a girl char that all girls love shiny gold (joking).Have a good income of gold really the only one, since you leave or creeps to your carry, gave the advantege to build fast your item :).
In alternative as show by other guide you can use flat armor or hp/level
Flate Magic Resist
just for defense your self against enemy spell or gank from mid.
As i said before we love gold
Cv i will not change this spell with nothing, have save me much time even if the buffed it.And is a good item timing for counter jungle the enemy jungler.So you jungler can see when buff are up or where it is the enemy jungler.
For the flash did you relly need an explanation its an escape spell for really get out of the trouble
Leona's damaging spells affect the target with Sunlight for 3.5 seconds. When allied champions deal damage to those targets they consume the Sunlight debuff to deal additional magic damage. Bonus damage is 20/35/50/65/80/95/110/125/140 (upgrades every 2 levels).
This is the reason why Leona is a viable support.Try to time your spells! Have Ecplise turned on, then engage with Zenith Blade, let your partner hit, follow up with Shield of Daybreak, let your partner hit, then Eclipse should strike, let your partner hit, if the target is not dead -> Solar Flare into his face!
Cast Eclipse -> Zenith Blade -> Hit! -> Shield of Daybreak -> Hit! -> Eclipse explodes -> Hit! -> Solar Flare -> Hit!
This rotation might be hard to learn, but if mastered and used correctly it can be devastating.
Q: Shield of Daybreak
Leona's next autoattack deals an additional 40/70/100/130/160 (+30% of ability power) magic damage and stuns the target for 1.25 seconds.
Cooldown 11/10/9/8/7 seconds
Cost 45/50/55/60/65 mana
With 40% CDR (that's what you want to get) this spell has a cooldown of round about 4 seconds. Together with Zenith Blade it is such an powerful CC combo. This spell will also affect turrets and reset your auto-attack, so hit the turret and then immediately hit Q to maximize your damage output.
Leona raises her shield to gain 30/40/50/60/70 bonus Armor and Magic Resistance for 3 seconds. When the effect ends she deals 60/110/160/210/260 (+40% of ability power) magic damage to nearby enemies and prolongs the effect for a bonus 3 seconds if any enemies are struck.
Cooldown 14 seconds
Cost 60 mana
This shield is not merely for damage (which is also pretty ok), but rather for the given resistances.Used in combo with iron of Solari and you will out from a teamfight with almost all you hp intact :)
E: Zenith Blade
Leona projects a solar image of her sword which deals 60/100/140/180/220 (+40% of ability power) magic damage to all enemies in a line. When the image fades the last enemy champion struck will be briefly immobilized and Leona will dash to them.
Cooldown 13/12/11/10/9 seconds
Cost 60 mana
Never, never, never hit an enemy accidently or you will die.It s good initiator skill and can be use for reach enemy that run away
R: Solar Flare
After a brief delay Leona calls down a beam of solar energy to deal 150/250/350 (+80% of ability power) magic damage and slow enemies by 80% for 1.5 seconds. Enemies in the center of the effect are stunned instead of slowed.
Cooldown 90/75/60 seconds
Cost 100/150/200 mana
A skillshot AoE-Stun-or-Slow-Ultimate with fairly low cooldown (36 seconds on rank 3 with 40% CDR). This spell can change teamfights! Even if not stunned Solar Flare still slows for 80%(!) which is almost the same as a stun. It is also your spell with the highest range.And why i love use it when enemy are preparing for teamfight.Solar flare-zenith blade-eclipse-Shield of Daybreak all dead :)
Creeping / Jungling
You are a living jungle timer so in combo with your CV keep in mind the respawn times, they are sorted by importance in descending order.
Baron Nashor: 7 min
Dragon: 6 min
Blue and Red Buff: 5 min
Mini Golems, Wolves and Wraiths: 1 min
Leona is a great cc champ for early harrass your bot lane.When you have mastered the combo of spell you really can do the difference in the early-mid game during the ganking of bot lane.
As you see i love build her tanky so in late game you will be a stunning support tank, you initiate the fight, your protect your mate with your active build.
But keep in mind even if you do all correct, nothing can save you and your elo from bad or troll team/player.
thanks for reading my first guide, sorry for my broken english and THUMBS UP if you liked the guide.