Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
Up until i started playing Taric when he was free two weeks ago, i didn't play tanks period. support and damage only. But the time came when i needed to build a tank because the rest of my team locked in as damage, so i tried out a tank Taric since he was the only character i was comfortable with that was capable of doing so. This is just what I've thrown together and has worked best for me.
Past Rylai's you can pretty much get whatever you think suits you best. Generally i don't get too far past it, so it depends on your team mates and the team you're playing as to what is best for you to get.
I just recently hit level 20 so i don't have all my runes worked out, so thats up to you.
I pick ignite because i enjoy having it, and clarity because it's incredibly useful in two ways -
1. Early game (or any time in the game especially in a team fight) if your team mates are getting low, you can supply them both mana with clarity and health with your heal.
2. In a sticky situation, like if you get ganked, you can pop your ulti and run. Since your ulti heals you, but sucks your mana you may either not have enough mana to survive for very long or not quit enough to flee to freedom by your tower. In this case you run until your ulti + heal draws down your mana, pop clarity and keep on going. This has gotten me out of several bad situations.
The last game i played with this build i went 8-1-14 and they surrendered at 25.
admittedly, i don't always do that good but i'm not that fabulous a player yet.
This is just the items and build i like, so i thought i'd share it :)
i don't know my way around the runes and such too well, so that's mostly a combination of other build's suggestions.