Class Power Source

[Kurald Galain]

Discipline, not yelling until the magic comes out.

Fine. Wizard and Swordmage, then.

The point is, there is absolutely zero difference in fluff between "arcane" and "psionic"; the only difference is mechanical (i.e. power points). Note that pretty much all classes in the PHB3 exist to show off a new mechanic, and only the monk represents a literary archetype that hadn't been covered by other existing classes.