The Bastion is an optional side quest tale that Geralt can partake in while exploring the surrounding area of the Kaer Morhen map. The bastion quest begins automatically as you enter the Bastion landmark, just to the side of Kaer Morhen proper. Upon entering, Geralt’s memories will come back to him, which will begin this very small but interesting tale. Here is a Bastion Walkthrough though, thanks to some slippy features of it.

The Bastion Waltkrough (level 23)¶

Head back west, then north along the road, ditching it for the unmarked trail to the north-west. Your goal is to return to the fork in the road that led to the signal tower, this time ignoring that path (the south-eastern road) and traveling west to reach the bastion, which fortunately has its own signpost.

Enter the Bastion through the northern-most of its two gates to start the quest “The Bastion”. Geralt will comment on his past in this place, after which he’ll be attacked by a quartet of Wraiths (level twenty-three). Put them down, then equip the Magic Lamp that Keira gave you and use it to watch a ghost scene north-west of the gate. The only thing more difficult than fighting monsters is training to fight monsters, it seems.

Make your way west to find a burned-down wooden structure near some stairs and activate your Witcher Senses to find a skeleton in the the ruins, which you can loot to find “Varin’s Journal” and the “Diagram: Wolven Steel Sword”. That’s the real treasure here, but why not finish up this quest? Head up the nearby stairs and walk along the crumbling battlements to the north to find another ghost scene. A third ghost scene can be found through a doorway to the south-west, while a fourth can be found to the east, near some stairs.

The Bastion: Boy’s remains¶

After watching these four scenes Geralt will be able to identify the ghost, and a solution for its desire to linger. Head up some stairs to the east and climb a ladder to reach the top of the wall, then head north down the length of the wall. Climb a ladder, then immediately drop down into the ruins of a tower and turn north-east to witness a fifth and final ghost scene. Geralt with sympathize with the boy’s method of death, after which you’ll need to examine the bones to pick up the “Boy’s Remains” .

With these remains in hand, return to the courtyard, where another four Wraiths (level seven) will pop up to challenge you. Put the incredibly low-leveled spirits down, then head back into the chamber along the western end of the keep (where you watched a ghost scene earlier) and bury the boy’s bones. Once done, the young Witcher trainee will finally be able to rest in peace.