Hello witchers,
I've found a few posts concerning the Quest "Berengar's Blade". For all I can tell they belong to a later part of the quest.

As a quick notice my game runs in german atm and switching to english to verify the information for this post didn't work. Not a big issue, but my wording might not be exact in every context.

So I have rescued Ciri and started the questline leading to the siege of Kaer Morhen. I've been running around the castle for a while, talking to people. While doing this I found the quest starter for Berengar's Blade. Didn't bother much and put it away to do it later, but as soon as the council before the siege starts, the quest automatically fails. Since I didn't want the quest to fail I went back to a savegame where I had already picked up the quest, but not yet entered the main castle.
After reading the notes, nest step in the quest is to talk to Vesemir. This is where my problem is at. Vesemir only ever gives the answers belonging to the Kaer-Morhen siege ("if they bleed, we can kill them", etc). I cannot talk to him about the quest of my topic.
Is there a way to do the quest without going back to an old save?

Thanks all,
Eleusius.

P.S.: I'm running the next-gen update with gog Galaxy keeping me up to date.

You can go directly to the cave and find the diagram and the quest will update without speaking to Vesemir.
If you follow the river south of Kaer Morhen east all the way until it turns north, go north and the cave is on the east bank about level with Kaer Morhen. (the superior wolven boots are there too.)