Variant Rules (JJBA Setting)
From D&D Wiki
The following are writeups and links to various variant rules this campaign should use.
One Currency System
While ki acts in a vacuum mechanically in 5e, in canon it is something of a universal lifeforce. This variant rule is intended to bring that concept into reality. Reiki points and spirit points are equal to ki points. Spell slots are equal to a number of ki equal to 6 times their level. Chakra is worth half as many ki points, and psi points and aura points are worth a quarter as many ki points.