Realms of Arkania: Blade of Destiny

Note: Before attempting this achievement, you should make sure you have a party member that can open locked doors, whether it be by picking the lock, magic, or brute strength. You might also want a character with good perception if you don't have one already, as well as a torch.

The abandoned hostel is on the road between Daspota and Ottarje, which is located almost at the center of the map, just above Prem Bay. It's a random encounter, so you might not always locate it while you're traveling. But once you do, stay and camp. I recommend saving at this point. There will be a lot of combat in between!

Sleep for a bit, and then when you go to leave, you will get a prompt to explore the hostel. Do so. Once inside, you'll have to go through at least one battle with the undead, but it shouldn't be too difficult. Then, in the very back of the room, there's a second door. You'll need to break it open, hence why your party should be prepared. It might be worth saving a second time too.

If you can't get the prompts to unlock the door, try looking directly in the middle of it, near the lock. Three options should pop up. If whatever you attempt to do fails, reload the save and try again till you get it.

Once inside the second door, another battle will likely take place. Get through it however you need to. Then head to the entrance in the back, past the first door with the chest (though you can explore it if you want). There are two levers here, and pulling one should open a door in the next room. You need to head to the 2nd floor of the Hostel. You'll know when you're in the correct room when you run into an Alchemist. After the fight is over, there will be one final door to the left. You need a high perception to get it to appear, but the ritual is on the other side.

If you get the error message saying "sadly, _______ cannot open the door", just take a step back and move forward again. Keep doing this until you get lucky and it opens. Immediately as you enter, you will get another dialogue box about the ritual.

Choose to interrupt it. This will pop the achievement. You don't need to win the fight, so you can reload your save and exit if you prefer.