Leona is very unique and a fun support. She, honestly, has no counter. If played correctly you can out support anyone.

Like other champions, you have to wait for the right time to engage. NOT with Leona. You have to constantly stay in there face, 100% of your time. Or you have a chance of losing bot. DO NOT play if your ADC is passive. It will not work.

Flash
I use this ability for 2 reasons

1)For early turret dives, its a great way to flash right out if taking too much damage.

2)If your sitting in the bush waiting for opportunity to engage, and its taking to long. Flash can be used to get right in there face for a Q-E combo.

Exhaust

The reason for this rune set up, is it fits her play style perfectly. Your so tanky, plus with [Ohmwrecker] it makes early turret dives successful. Never had any problem running these runes.

I find myself being able to out lane anyone because of this set up. Keep in mind, this an early game advantage guide, and this setup only works when you are winning your lane and feeding your ADC.
Maxing your Q first give you that shorter CD on your Q to insure that kill. And making your E end allows Mid-Late game combos to happen much faster and keep you in fights.

This is your ideal combo:

Level 2: Zenith Blade. When it lands, pop your Shield of Daybreak

Level 3: Pop Eclipse as your getting ready to throw Zenith Blade. When it lands, pop your Shield of Daybreak

Level 6: Pop Eclipse as your getting ready to throw Zenith Blade. When it lands, pop your Shield of Daybreak then drop your Solar Flare.

Leona has 1 weakness. If played correctly, its not really a weakness.

When the enemy team gets Cleanse it could break your game. BUT there is a way around it.

Throw you Zenith Blade, and run. MOST players will use it thinking you will combo. IF THEY DO NOT USE IT. Zenith Blade and Shield of Daybreak combo until they do. DO NOT USE Solar Flare while Cleanse is up, it could be devastating.

Pink is Vision, Green is Sight.

Warding Blue Side

Warding Purple Side

How to ward over the wall into river bush (Purple side)

VERY TIP OF THE TREE