Leona is an amazing natural tank. She can take massive amounts of damage with her Eclipse. She can be built FullTank or as an AP OffTank and still be able to take alot of damage.

I prefer not to build her like that but if my team needs someone with damage output because our carries arent doing there job I will switch up my build. Leona has a great AP scale on all of her skills which means building her slightly AP makes her able to put out a good amount of damage and still tank "likka bowss"

With my full tank build and the prock on Leona's Eclipse she will have about 300+ armor and magic resistance. and with over 3200 health it makes her able to take insane amounts of damage. I have gone in 5v1 to get my team out and survived and I have also had 5 ultimate abilities used on me before i died and it was usually due to ignite, not even the characters skills, that i died

the Rune and Masteries set ups i have shown are interchangeable. It all depends on your team and weither or not you trust them to do their job. There have been times when I expected to build FullTank but instead built AP OffTank because my team couldn't deal any damage other times i looked at my team and thought i would have to deal massive damage while tanking and used my AP OffTank set up and ended up building FullTank because my team was dealing a surprising amount of damage. I only put my set ups like this because these masteries, runes, and the build i placed with them go perfectly together but they can also be switched up. Most of the time when i play Leona i use my AP OffTank masteries with my FullTank rune page.