Using energy drawn from the shards or the sources themselves, people can manifest psionic powers. Within the Erusian Realm, psionics can draw up a store of energy within themselves when they rest (up to their powerpoint limit). Outside of this realm, they must rely on psionic batteries.
Non-psionic characters can use abilities from psionic batteries after gaining the Psionic Training feat. They can only use abilities that they have been trained in, using the power points stored within the batteries.
Psionic batteries work similar to cognizance crystals (as detailed in Expanded Psionic Handbook). The batteries can contain anywhere from 5 to 500 power points, and even more massive ones are known to power the battle-platforms.