Hello
To get the "Feign Death" potion you have to go to the church which is at the north of Rivertown near the cursed Abbey and talk with the priest.
Ohhhhhhhhh, you don't say but then silly me you just did.
*bops self in head and exclaims Ow!*
I have been to that Church and done the quest, I shall give another visit to our friend.
Mythanks Barta.
gamegurl