Mana Manipulator,Dorans Ring,Lich Bane-Enough mana.But i shoulnt be stopping you if you want Archangels Staff.
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Btw all of you guys tnx for all positive votes im glad to have guide that in one of positive ratios.
Bettwen to those that are reading my guides and didnt see any new ones i am working on big one called:
Assasins-Job,Gameplay,Kinds!!

Great guide +1 although a archangels is a great item on sona becausue it gives you endless mana to spam with

Im just respecting roles that Mobafire ppls gave to her:D

Getting better on the runes now! What I don't understand is why you want a sona-player to farm? A support should go with a carry (or offtank if you want high sustainability in lane) and that carry needs all the farm. Why not start off with some gold/10 items? The only time you should farm is of your carry is dead, ganking or just in base.

nice nuking support build

Item section is a bit messy, but otherwise I like the original items and skill sequence. Maybe make the item section a bit more clear. +1 for a nice idea, balanced damage and supporting with aura item. Keep up the good work :)

I have changed mana seals into mana regen and added more ways to go with items.
I prefer ghost over flash becouse you need to stay in range for your casts while flash wont do it for long dude that im supporting will just go away.And speed buff is extremely imporatnt especially withoun Ryalis Crystal scepter.And Lich bane is probably best offensive item on Sona-Since you like Hymn of Valor so much you probably like playing her offensivly so you should probably know that.Btw im taking both of those becouse i need both of them even not much as my heal.

Your seals are bad, seriously bad. Get mana regen or mana regen/lvl seals, not mana. They work much better. Other than that, your item build is quite original, but I think you should get a bit more cooldown reduction maybe...?
Also if you don't stack hellish amount of either CDR or AP, there are better items than Lichbane for Sona. And since you buy AP at all, you shoul max Hymn of Valor second instead of speed buff.
Summoner spells: you should take Flash maybe instead f Ghost, because Sona has a built in Ghost and that is her E skill. Lower levels that's **** but still gives a nie speed boost when spammed.
Maybe get Aegis of the Legion before Will of the Ancients since it's more of an early game item? Personally I don't like it on Sona because her Q spell aura is better, but I'd still pick it slightly bit earlier when it makes more difference.

Other than those things, this is quite nice but maybe explain more on your item choices, why these and why not something else? Maybe alternative item choices?

Thank you for mentioning.I have updated Warding part.

2 words: Missing Wards.