Hm.. I've been recently experimenting around with Sona, and I've got some builds too.
If you want a strong sustain Sona, I'd go with 4/5/21, getting first the 4 points of cdr (you don't need to though) Runes are, 9x flat Armor marks, 9x flat Armor seals OR scaling Mana regen per level seals, 9 Scaling magic resist glyphs/ flat AP glyphs (against AD teams), 2x flat CDR quints, and 1x scaling CDR quint.
I usually had good results with that build, keeping me alive at most situations, as well giving alot of utility. You'll start the game with 15% cdr and can get 40% CDR at late game.
I usually start either with
or
, depending if I can poke the enemy bot lane.
After first back, upgrade your gold income item and start either on the
or
, buy 3 wards and replace the yellow trinket with the red one. You might've scored an Assist or two, wich allows you complete your sightstone/chalice , wich allows you to start with one of my favorites: the
. It gives you alot of sustain, and the
will give you alot of stats you need, AP, Health, and Mana. It will make you quite tanky, and allows you to sustain through a teamfight. After that, I'll rush the
and some boots, Then I'll start building a
. Yeah it's quite weird to build this item on Sona, but it gives you alot of stats you need, armor, mana, cdr, and it's passive synthesize very well with Sona, allowing her with each AA to slow her targets.
So far your build must be
(any type of boots works)
Upgrade your boots and start to roam to other lanes to get some Assists. While I prefer the
, so you can poke enemies and earn gold while you earn assists, the
is more a passive item, wich is better if you're in lane. I usually don't bother to upgrade it to a full item and replace it with a situational item, that's needed for me or my team. (anyways, till that you'll have 40% cdr, meaning you can get an item without cdr, other wise you spend gold on nothing)
If you don't use your CDR runes, you can replace them with AP, allowing you to build an
wich can be upgraded to
or
, wich are both great against a heavy ap team.
Against AD teams, I usually go pure armor, and not getting a chalice, since it'll get replaced by a
. (I usually don't get the additional mr if I'm laning against ad heavy teams. As well I don't keep the CDR runes if I know that I'm playing against a heavy ad team)
My full build would be..
Wich would leave me really ranky, and benifiting of my mana items with the archangels passive.
It might be weird, but those builds did work very well for me uwu
Sincere!