Weapon Synthesis

 is a process that appears in Castlevania: Dawn of Sorrow. With Yoko Belnades' help, Soma Cruz can forge new weapons by using souls he collected in the castle. This allows Soma to upgrade his equiment for free, but requires the player to take some time to gather the desired soul(s).

is unlocked when the player escorts Yoko to her shop in the Lost Village. All weapons can be forged as soon as this option opens. Souls used in this process are definitively removed from Soma's body, meaning the player will need to start a New Game + to obtain unique souls from bosses once again.

A non-solid line denotes the addition of a weapon and a soul while a solid line denotes the result.