Well most people know their champs have mana problems so they should know how to manage it well enough, if you have clarity that's great and all, but most of the times they're looking for a reason to go back to base anyways so they can purchase new items. I've played with clarity a lot on Sona, and I just stop using it after mid game. I also play with a lot of teammates that don't have mana, not everyone's gonna need mana at all. So clarity being an absolute must is quite frankly not true, there is better alternatives like Clairvoyance if you find you are very good with it. I'm not good with Clairvoyance, so I just go with what I'm good with. But i'm also not "claiming" anything here, this is just the build I go with, and it's my own opinion. People build AD and full AP as well, there's more than one way to play her.

I also didn't get magic penetration because it's not needed. I already get first bloods more often than I want, I want my carry to get those, not me. This is mostly for support and not for getting kills.

See above comment^

The biggest problem I have with this build is your claim that Clarity is useless late game. I assure you, if you're playing Sona support like she's supposed to be played, it is most assuredly not useless. Maybe you have all the mana you'll ever need, but clarity can help your teammates out immensely.

Also, no Magic Pen mastery? No Sorcery to get your abilities online a little quicker?

And last, you don't take Song of Celerity until Lvl 10 when it can be used earlier?

Mmm. I'm sorry. -1.

Yeah perseverance is not that great, i just ran out of points to spend it on stuff. I might rework the masteries later to maximize her situations. I found out that I'm not always using cleanse and ghost, so I might not need the summoner spell cooldown reduction as much as I first assumed.

Thank you sir! I've been working hard on making the guide easy on the eyes and making sure it reads well.

ofc, there are some mistakes too, generally, I rather use Clairvoyant instead of one of your summ spells, its must-have spell for supports like you., also i wouldnt spend any points on Perseverance, it do nothing extra change to your build, rather spend it on something other in Utility class... but still good build

Wow, Ive never seen Sona with 168/177 resist, she could take some dmg and still decent ability power to make some effect , nice build, +1