Orbs Of Power
Origins
It is theorized that the orbs of power are crystallization of the interactions between the magical energies of the different planes of existence that intersect with Thera. The largest orbs for example, represent points of convergence between a Material Plane, such as Thera, and a Chaotic Plane, such as the Feywild.
Natural Deposits
Smaller orbs which are not perfectly spherical are found in various deposits all over the world. Many of these were formed naturally, through some unknown mechanism in cave systems surrounding one of the larger orbs.
These larger orbs have yet do be proven to be natural in origin or artificially made.
Man-Made Orbs
Some members of the Reformed Church of the Divine Masochist have been known to carry small portable pedestals which, in time may form an orb of power atop it. It is not known how these pedestals are created, or how the Reformists gained access to them, but these are the only known sources of man-made orbs of power.
Types of Orbs
Orbs of Enhancement and Repulsion are thought of as related types of orbs of power, in part because they are found in the same deposits. It seems as though these are duals, related but opposing in purpose. It seems to Ritma theorists, that enhancers perhaps are a conduit in which magical energy from Chaotic Planes are siphoned into a Material Plane, while repellers work in the opposite direction, instead siphoning magical energy from a Material Plane toward some other.
Orbs of Endowment and Orbs of Absorption on the other hand have never been seen from naturally-occuring deposits. They've only been taken from captured Reformist agents, perhaps formed from their pedestals.