Mortal Shell has 4 melee weapons and one firearm. Below we will tell you how to get a smoking mace.
And everything is actually quite simple. All melee weapons (except the consecrated sword that you get in the prologue) are unlocked in the same way: you need to find the book, interact with it, and defeat Hadern, the character you fought at the end of the prologue. In doing so, he will use the weapon that you have to unlock.
The Smoking Mace can be obtained at the beginning of the temple grounds. To get there, exit the tower through the door, follow to the right, go around the tower in a circle and jump down from the hill where the bandit camp is located. Further there will be a way up, around the tower. But you go a little to the left, to a fork with a sign and an inscription. Go forward from it.