Hey, I'm Nonyagumo and I main sona in a low elo of about 900 (sadly w/ over 60 games in ranked), and found out some great interesting builds i wanted to share.

The Runes I'm using at the moment are APC ones but you can trade them out for GP10 runes if you want.

The items are the main part of what I'm trying to let you know. In build 1 i focus on spamming late game and never having to worry about mana and gives some mr against heavy teams. This has been my main item build until recent. I left it up to 5 items (athene's been optional b4 the last item) the last item needs to be what is needed.

either rylai's crystal scepter if you need a bit of damage and life.

thorn mail if the main damage is physical.

abyssal scepterif the main damage is magic.

this build of items is mainly used against heavy cc teams. In build 2 I focus on getting health regen/ raw mana regen to allow of easy to live against constant damage. eleisa's miracle is an item i get instead of a shurelya's do to the cost decrease and nice health/mana regen along with the tenacity. I've got 4 items in this build allowing for you to get situational items for the last ones. This allows your early/mid game to work out well while allowing for your late game to be up to you if the game lasts that long.

It is the Start of Build 1 but I haven't used it much, but it works out well if your getting a lot of the kills or some cs bot lane to make up for your adc not doing so well or your team is just lacking in damage. I went it and got a quadra-kill in a ranked match 900~ elo.

Will work on coming up with a build $4 that comes from build #2 like I did to make 3.