LoL Support Build (personal fave)

Hello folks, for those that don't know much about me, I am a League of Legends addict...and with that being said..I have written up my support build for a friend and teammate of mine.

My rune set up is as follows for true supports that need a bit more hitting power. (Such as Sona, Nami, Soraka, and others like them)

Quintessences: Greater Quintessences of Ability Power (3)
Glyphs: Greater Glyphs of Magic Resist (scaling or flat, both work. 9 are needed)
Marks: Greater Marks of Magic Penetration (9)
Seals: Greater Seal of Magic Regeneration (5) and Greater Seal of Gold (4)

Explanation on the seals: I added in the seals of gold so that supports (who are not supposed to have much farm) get the gold needed to buy their items and in turn, help out their teammates with fights.

My masteries are a bit different than some. However I find that with the season 3 changes they made to the mastery tree, these are the best. I run a 0-9-21 mastery page for my supports, which means 0 points in offense, 9 in defense, and 21 in utility. The way I illustrate my masteries is  by showing the number of points in each spot, any thing marked with a 0 remains empty, and anything marked with an x shows a blank spot. (if needed, please contact me for images.)

Defense:   Utility:
1-0-4-0    0-1-3-0
3-0-x-0    0-2-0-2
0-0-1-0    4-0-0-1
0-0-0-x    2-0-0-1
0-0-0-0    1-1
  0             1

My build for a support is as follows. Please keep in mind that anything marked with a * is for situational use, if you do not think it is needed, then don't build it. Also anything marked with 2 *, are used upon activation and those marked with 3 are both of the above. I also recommend keeping pink wards handy for the river bushes.)

Start: wards, WARDS, WARDS ( I cannot stress them enough...however for starting, 2 sight and 1 vision will suffice)
        Health and Mana pots, by your first time back, you should have boots and Philosopher's Stone.
Mid game: By this time you should have Shurelya's Reverie** and start in on your Zeke's Herald as well as the first part of your Sightstone. (remember, wards save lives)
The tier 2 boots you buy depends on who you are playing, and how much damage you are needed to output in team fights, I recommend cooldown boots and magic pen boots. *
Late game: Ruby sightstone, Runic Bulwark* (some junglers may build this item, so coordinate with your teammates), Locket of the Iron Solari*** (this item really depends on who you are supporting with and who you are against. This item works best on tanks...but if you are a squishy support and need to become tanky, build this item. Activation is crucial for fights and if you don't know when to use it, then please do not buy it.)
I leave this item for last because of one reason
If you do not have a tank initiator, do not buy this.
Shard of True Ice*** is used upon activation and placed on a tank initiator and another situational item.

I hope this helps out!  
If you have any questions, please by all means send me a message or add me on League (NA server) Silent Revery
Cya on Summoner's Rift!

-Auddy