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.
Good mana regen so long as you're not spamming spells
Very Tanky, mainly because once someone realizes you're a Taric, you will be focused.
Increased experience makes it fun!
You give everyone around you mana regen, health regen, and spell vamp
You will become a target. No if's, and's, or but's about it.
Not a lot of individual kills (lots of assists though)
This build is actually a credit to my friend Eric. Let's go over some basics:
Grab the mekki pendant and your dazzle. Hopefully you're laning with either a ranged champion, or a very good and aggressive melee / caster. Xin Zhao seems to work perfectly for me. Don't overextend. That is the key to the early game laning. When the opposing team gets in range, stun them, run back. Keep this going until you are at a very clear advantage. Why? The constant stun-n-run will keep them annoyed and get them to make a dumb move faster. The moment they do, you and your lane mate will unleash HELL upon them. Level 2 grab your heal, and heal your lane mate whenever you can as it will also heal yourself. Level 3 grab shatter, on those instances where you just 100% KNOW you can do some serious damage to them. The stun duration doesn't change for dazzle, which is why I don't level it as aggressively as I do the other skills. You may not get the kills in your lane, but most, if not all, of the credit should go to you as you stunned and damaged the opponent while assuring your lanemate doesn't die.
You've got your ult, great. You want to abuse it in "OH ****" situations where you either have mana or have clarity up. Another time is when there are no champions in your lane and you're trying to do as much damage to the turret as possible. it increases your damage, but only leave it on for a few seconds, especially if clarity is down. Hopefully by now you've got Aegis of the Legion and are working on the giants belt for a soul shroud. This makes you useful in mid game gank and team fights. You give everything around you armor and health regen, and mana. Keep in mind that though you are powerful and durable, you should not try to tank. Your role is the stun / burst -> heal. Whoever engages, keep them healed. If a teammate runs away, heal. if an enemy runs away, stun.
With your items, standing near your team is often enough to get them from the clutches of death. in case its not, throw a heal down. If a few people are heavily injured, stand next to them with your ult on for around 5-10 seconds(depending on the damage). On the opposing team you want to always single out 1 target who you will stun and your team will focus down. Ping them (G + left click the target). tell your team in advanced that when you ping someone, you want them focused.
Who exactly is focused depends on you and the current state of the game. Did your other side lane feed? Aim for the most fed. Getting them up and out of the way will make the rest of the people just that much easier to deal with. If there is a stun on the other team, stun them. makes it so that you don't lose a DPS or Tank in the fight. Use your best judgement. It will take a lot of attempts and failures to build up the mental experience to know who to click.
About my items
Kindlegem: 900g for health and 10% CDR. Point me to where this isn't good.
Shurelya's Reverie: Mana, an AoE speed increase, and CDR? Sign me up.
Mercury's Treads: IF you are a super mobile mobile fountain and the other team lacks in CCs, feel free to get boots of mobility, swiftness, or berserker's greaves (to help with mana regen).
Aegis of the Legion: Really good support/tank item.
Will of the Ancients: so long as SOMEONE on your team uses magic damage, it's worth it. IF no one does, build a hextec revolver as it gives you more mana per hit and lifesteal (for when you're heal is down)
Chalice of Harmony: This item can be sold to help pay for the giant's belt in the Soul Shroud. What you fill here is your choice. More spell vamp? Damage? A Zeal? the choice is yours depending on what you feel your Taric needs most.
Other useful items, if interested:
Stinger/Nashor's Tooth. Attack speed, cooldown reduction, and Mana regen. fairly good item for a Taric.
Other summoner spells:
Clairvoyance: it's not my thing, but if it's yours, go for it.
Cleanse: I can see how it would be useful, but odds are if you're being focused so hard, you're probably not going to be getting away.
Flash: Fairly good in escaping situations
Ghost: if you really, REALLY want that one person dead, go for this.
Fortify: Just. To. Be. A. Douche.
Exhaust: if you just feel there's a bunch of melee DPS on the other team.
Ignite: ... if you feel like it.
Rally: if you have a lot of melee on your team and you know you'll do well with them (I.E. a game with friends) go for it, as it's a great Damage boost to anyone around you.
Things you should NOT get
Revive: If you get revive, you plan on dying or being dead most of the game. if you do, get better and stop dying so much.
Smite: ... Why, oh WHY, would Taric need smite OTHER than to be a total jerk to anyone jungling/doing baron/doing dragon?
If my grammar makes no sense or someone notices something I forgot to mention, let me know as I'm fairly tired while writing this.
Edit: In the last patch they changed the build items for Soul Shroud. It no longer takes a giant's belt. You should still take this item after Aegis, however.