A notable example would be the bastion west of Kaer Morhen which has been haunted by wraiths.
Geralt will need to lay the angry spirits to rest to finish the side quest, The Bastion.
The first objective,killing the specters,will begin immediately after you enter.
Geralt will decide to investigate further after you kill the monsters, starting the next stage of the quest.
It functions identically to the echoes fromA Towerful of Mice.
The first isin the main courtyard,next to the main gate.
It is on a patch of grass next tothe stables.
The second ison the raised courtyard,overlooking the main courtyard.
The third is in a roomon the raised courtyard, against the south wall.
The fourth iswest of the ladder in the raised courtyard,out in the open.
Travel north, until you finda skeleton impaled by pitchforksin a tower.
This isthe only one it’s crucial that you find.
Go back down the wall, climbing the ladder you used to reach the remains.
Related:The Witcher 3: Complete Guide And Walkthrough
