Spirit weapons are a topic again so I’ll toss my hat into the ring:
Vitality is basically an overglorified support stat that just supports you, so I have an idea based off this. What if we can infuse ourselves into things by default? Let me explain:
My idea is for spirit to act as a sort of mod/aura in order for them to not just feel like reskins. They would be a mode of sorts for weapons and possibly magics and fighting styles which unlock specific skills, in exchange for passive HP or energy drain, and can be turned off. Say for example I have a hammer. I turn on spirit mod and it changes it to to a spirit version that hits harder and gives me access to certain things. IDK really, came up with this on the spot, good night.