Will of the Ancients is no aura item any more :/

You have a few bbcodes that need to be fixed.. any codes in red means there is something wrong.. like there is no "sight ware" its called a Stealth Ward and there were some others too.. also I would run Exhaust instead of Clairvoyance.. :)
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The guide being not complete is really dragging it down.

Clairvoyance aside, your item choices are really strange. I don't get why I'm seeing a recent influx of Clairvoyance and zeke's herald in guides, did someone of note use it somewhere?

Will of the Ancients is weak on champs that don't use the spell vamp effectively and Sona is probably one of the worse candidates for this item.

No skills maxed by level 9 and no masteries in cheatsheet.

I think you should take a look at other Sona guides, as well as how professional players specc Sona.

A few things I would like to discuss;

• Nobody appreciates Clairvoyance, you should not pick it.
• Your items in the cheat sheet are a little messed up. Be organised.
• Your guide is very incomplete, it lacks detail.
• You have a few coding errors, look over your guide.
• Your cheat sheet doesn't have the masteries shown? Am I the only one?
• Not too happy about the runes, but I don't play Sona so I am not really sure.
• No Sightstone. Very, very bad.

Hope I kind of helped you. Hope you also make us of the feedback, good luck!