Boss Soul Weapons are weapons crafted from the souls dropped by bosses throughout the game. There are various weapons which can be constructed from the souls. You may also consume the Boss Souls if you wish, but they are best reserved for the construction of these unique weapons.

.Thrusting Swords.Katana.Greatswords.Curved Greatswords.Ultra Greatswords.Twinblades.Claws.Axes.Greataxes.Reapers.Spears.Lances.Halberds.Hammers.Great Hammers. Gal gun double peace mods.