The Deadly Daemons Of Oninaki
Even lost souls have their use in Oninaki, Square Enix's action-RPG from Tokyo RPG Factory and Chrono Trigger director Takashi Tokita. The game comes out this summer (PS4, Switch, and PC) and its latest trailer shows off how protagonist Kagachi uses souls as powerful weapons known as Daemons.
Daemons are lost souls that cannot be reincarnated. Kagachi, who is a Watcher ferrying souls to the next world, puts them to work on his behalf in battle. Each one can be used as a different type of weapon (as well as assist Kagachi defensively) and they can be swapped in and out in real time.
For more on Oninaki, check out the game's debut trailer.