The goal's to be able to get around the map. There's multiple ways to play it, but some of the hardest carries are generally:
is a pretty good rush domination build, because your goal is to be on perma gank, and it has a ton of move speed, along with pretty good cdr and camp clear.
You can also go AD/attack speed based around a
, but it's not as fast moving, and Leona's skills don't scale to an AD build, so while it's okay at clearing camps, it's slightly less reliable. Still good though.
You can also go
, but you better not have anyone who can burst mid-HP levels if you do on the other team. Doing so could get you a 15-18 minute win, but it has its late game drawbacks.
Runes:
Aftershock is meta. If you go Grasp, it'll be underused and unreliable. She has one of the easiest Aftershock procs.
Bone Armor
Second Wind
Unflinching or Overgrowth (generally go Unflinching)
I secondary Domination
Taste of Blood
Ravenous Hunter
Ravenous stacks pretty fast on a good Leona, and will pretty much overheal her after 11-13 minutes on solo drakes with Cinderhulk. Takes about as long as any non skirmish jungler, and good at counterstealing drakes, because of her easy to land stuns.
Taste I just get because no other option in domination really scales well on a Leona (her AP ratios are too low to be useful in most regards, and I'm on constant gank, generally tanky, and don't need to ward as much as a vulnerable jungler.
Skills: Generally start Q or W, and level 2 the other. The Q Stun is used when W is down, so that you always either have reduced damage from W being on, or have the jungle mobs stunned. You level W and E, because the extra armor/resist is useful, as is E's CDR reduction on leveling (If you can survive without leveling W, rush E). Q isn't worth leveling, because it gains nothing but single target damage on leveling.
You'll find she generally pulls in less damage than most junglers, but she dominates in giving CC, chases, and shutting down peeling targets. Generally, you want to fight with an ally, since they will do extra damage each time you skill. Or, mop up someone with low HP. I wouldn't try to solo high scalers like Jax after a point.