Soul Weapon is available after reaching Master level 400 and completing the sub quest [Soul Weapon].
Soul Weapon can be found at [Character Portrait] > [Soul Weapon] in the top left corner of the game.
Soul Weapon consists of 3 sets: Hunter, Vampire, and Witch, and each set consists of 2 Soul Weapons.
Soul Weapons can be activated using Soul Weapon Activation Items, which can be purchased from the Arena Shop.
When Soul Weapon is activated, default options are acquired, and special options unique to Soul Weapon can be additionally acquired.
Soul Weapon's default options and special options apply to all battles, except at Lost Land.