Wine for the Swine is a side quest in Assassin’s Creed Odyssey.
Your task is to find the witch from Barnabas’ vision at Paros.
Here’s a walkthrough of Wine For The Swine in AC Odyssey.
Find the witch
To look for the witch, go to the island of Paros. The exact location is shown in the map below, marked as the quest symbol.
As there’s no fast travel point on the island, you can go to the opposite island.
Use the ship dock and summon the Adrestia, and go to Paros.
As you get nearer, use Ikaros to get her exact location.
You should now reach some sort of a ruin with plenty of animals. The witch is surrounded by them.
Talk to the witch to proceed.
During the conversation, you can either fight with her, or fetch her some wine.
If you wish to save time, killing her now would be great.
Personally, I chose the peaceful option.
Bring the wine to Circe
If you had chosen the peaceful option, you now have to get the wine from the exact location shown below.
Loot the wine from this area.
Now, get back to Circe.
During the conversation, you can choose to drink it or kill her.
If you drink it, you will lose consciousness. It’s easier to kill her.
If you drank it, you will then wake up in a tomb.
A boar will come after you. Kill it and go after Circe.
Get back to the ruin and kill her. The animals generally won’t attack you.
The quest completes here.