[quote=@DiamondBlizzard]
Let me be more specific as to what I think should be in each group, just a suggestion.

Mana = Magicks

Vitae = Magicks

Spirit = Magicks/Spirit Powers/Abilities

Psionic = Mental Powers/Prowess (Telekinesis, Telepathy, etc. Can cross over with Mana, Vitae, and Spirit)

Chi = Able to control literal energy, one with yourself, etc.
[/quote]
This is how I classify them (though Vitae is a new one for me). However, I will explain the mechanics thoroughly. It should be agreeable, in the end. Just be patient as I write about the Nexus (it'll appear like an essay). Give me a couple of hours.