Item description:

Walk towards the purple stone and continue heading in that direction.
When in front of the Soul-stone, interact with it to trigger a cutscene.
This cutscene is Baba Yaga, the Three Sisters (Baeb, Ayae and Gh'aa)
**You Can Press As Much As Possible On The O Button To Skip Faster,
It Will Let You Skip Bit By Bit At A Time**

You should see at least two selfish reasons of Ran away and Falk Friedman.
!!**Do not select the Nothing option. It voids the trophy**!!

Select Ran away.
Select Falk Friedman
Zoë will receive The soul-stone which gets added to her inventory.
(After A Cutscene - TMI trophy will pop)