by Catacomber » Sat Sep 10, 2022 4:36 am
There are a few Old Keys. : )
That could be one of three doors without a picture. One of those doors you need a lockpick for. Just pick the lock if your Lockpick skill is at least 10. The girl Mina who has the manuscript you want is beyond that door so my guess is that's the door you're stuck at.
However--there are two other possible doors--
The key (Old Key) to one of those other doors is in a barrel behind a green crackable wall as you enter the far north of the Old Tunnels from Regnald's Basement.
The other key (also called Old Key) for the other door is on a Skull relief in the southwest beyond a red crackable wall. The entrance to this area is a drain in the mid west of Bream Island.
If this doesn't help, come back.