There's an error here. In the rafters (where the three crossbowmen are) it says that there's a Penetrator, which is linked to the boss Penetrator. Dude, its the Penetrating Sword, not the Penetrator. you can find saidsword above the gate; the same gate that stops you from taking the most straight-forward route to the boss Penetrator.
Boletaria 1-3 Walkthrough / Discussion
This is the discussion related to the wiki page Boletaria 1-3 Walkthrough.