The mod currently only has the following command:

/superpower <set/add/remove> <Power ID> [Entity] which allows you to set/add/remove the superpower of an entity.

You can also filter entities by a power in an entity selector like:

/effect give @e[palladium.power=test:custom_projectile_test] minecraft:levitation 3
This will only give entities the levitation effect if they have the test:custom_projectile_test power