Mysterious_Man
A mysterious black-coated man who seems to know a great deal about Soul Wielders and related things. He refuses to reveal his identity, but clearly knows a great deal more than he will tell. He accepts Soul Fragments from Black_Souls as a form of payment for useful items for Soul Wielders. In exchange for Soul Fragments, he will sell legendary metals, and occasionally other useful items as well. Many of these items are useful to people besides Soul Wielders as well. Legendary metals, for example, can be used to forge powerful weapons and/or armor.
Permanent inventory:
Items that the Mysterious Man will always have on hand to sell. They cost 25 soul shards each.
Adamantite: A legendary red metal said to be indestructible. Absorbing it into a Soul Weapon increases the overall durability of a melee weapon, the clip size on a firearm, or the range on a thrown or propelled weapon. (Throwing knives, or a bow.)
Mythril: A shining green legendary metal, it is incredibly light, but still very durable. Absorbing it into a Soul Weapon decreases the weight of a melee weapon, making it easier to swing. It reduces the recoil on firearms, while increasing the penetration power of thrown or propelled weapons.
Orichalcum: A legendary bright blue metal, it is full of power. It increases the attack strength of any Soul Weapon to which it is applied.
Rare items:
Items that the mysterious man may not always have on hand. Their prices vary depending on how many he has.
Onyx: A legendary black metal, it is positively radiant with power... And dark energy. Using one is a sure fire way to gain a major power boost but... Is it a good idea?
Soul Chain: A chain that can attach a Wielder and Weapon together. Once attached, it becomes undetectable and can extend to any distance. It allows the Wielder and Weapon to draw power from each other, allowing one to perform a powerful attack by borrowing the other's energy, even over great distances. The effect also allows the weapon to remain in living form indefinitely.
Lucky Star: A star-shaped crystal. When absorbed by a soul weapon, it increases their luck! (Increases chances to get higher amounts of Soul Fragments from Black Souls by 5%. Also increases the minimum and maximum number of fragments from a Runner's orb by 2, and slightly increases the chance of getting an item from a Runner's orb instead of Soul Fragments. The effect can stack, so using more Lucky Stars means even more luck!)
Silver key:
Instantly unlocks a new (Non-ultimate) form for the Soul Weapon to which it is applied. For Soul Weapons whose living forms are tied to their weapon forms, it also unlocks the corresponding living form. No affect if all forms are already unlocked.
Gold key:
Unlocks a new ultimate form for the Soul Weapon to which it is applied. Also unlocks corresponding living form if there is one. No affect if all forms are already unlocked.
Lantern:
A lantern which can be inhabited by a Soul Fairy. While a Soul Fairy is inside, it amplifies magic from the fairy and grants a power boost to nearby Soul Wielders. The boost only affects the owner of the lantern (Defined as the last person who touched it.) and their allies. The Soul Fairy inside the lantern can stop ownership of the lantern from transferring if they so desire.