Dragon-slayer spear

"What the hell..." Mia muttered the second I opened the doors leading back to the main part of the shop. 

Because the path that we took before was now nowhere to be seen, replaced by a diagonal wall that cut the path to the shop and a hole in what used to be a wall before. 

'It's like an entire wall turned around,' I thought, looking for the signs of something like this happening. 

And sure enough, after just a few seconds, I managed to locate a rail on which the wall turned to block the entrance to the warehouse while opening the way to the secret compartment of the store. 

"This is where they hold all their valuable weapons," I replied offhandedly, slowly making my way through the secret tunnel. 

Back in the game, there were no traps in this place... But that's mostly because I reached this location through the proper means, by completing an entire questline and then challenges.