How to get the Bastard sword
Fitting of the medieval castle setting, Citadelle des Morts lets you wield a powerful sword Wonder Weapon. The first step is getting your hands on the base version of the weapon, which is called the Bastard sword. The Bastard Sword is a normal Claymore melee weapon. It can be used to either attack enemies or deflect projectiles. It will be made even more powerful by making it into one of the four elemental variants.
The map holds your hand through the first part, guiding you through the castle to unlock the Pack-a-Punch machine. Continuing the steps to unlock the Pack-a-Punch machine requires you to reach the Oubliette Room and shoot three locks off a crate. This spawns the map’s special enemy type called the Doppelghast. Kill it and it will drop the Blood Aetherium Crystal quest item you need to pick up. Then, finish activating the Pack-a-Punch machine.
Afterward, go to the nearby Quick Revive room and interact with the wooden door. This lets you speak with Gabriel Krafft and get a cutscene. Now, you’re ready to start upgrading your swords.