Faelon is not a magic-rich setting. Having said that, spellcasters are around and recognise that their abilities can greatly benefit the world around them. Most towns will have a potion maker, be it a local wise woman, the temple, or some other alchemist. Some temples also have people scribing divine scrolls (arcane scrolls tend to be rarer). Magic items tend to be made to order, if you're in a town which contains someone powerful enough to craft them. The caster will certainly charge large sums of money for the privilege, and frequently request (or demand) the shopper undertake some quest for them to get ingredients.
tu'vala
Least flexible magic item. Formed by fusing a masterworked receptacle item with a mirilli to create an item stable enough for anyone to use.
en'vala
Flexible magic item. Has a single mirilli receptacle. Characters who gain the correct training or spend some time experimenting can use these items. Further, more formal training allows the character to swap the shards.
sai'vala
Highest power of the "common" magic items. Has multiple mirilli receptacles. Sai'vala are difficult to control and only certain individuals can master the art of swapping their mirilli. They can only be used by characters with the Sai'vala Focus feat.
mirilli
Shards of power. They typically appear during inter-planar meteor showers and look like chunks of softly glowing crystal. Crafting a useful mirilli is practically a lost art although some dwarves and the few remaining high elves can do it. It's said the knowledge also lies in the libraries of the Order of Unified Magic. Once harvested, mirilli is charged by its creator to have desired properties. Sometimes extremely powerful shards have additional effects - desired or not.
Research has been done into synthetic mirilli. This substance cannot be refined enough to safely control the energies needed for powerful magic items, such as weapons but is relatively cheap to produce and not too difficult to buy. It is known as al'mirilli (more commonly magic dust) and is used by mages as a cheap method of crafting useful "mundane" magic items or as a substitute for (non-priced) spell components. Magic dust is also sold on the black market as a powerful hallucinogen and in certain circles it is used to add "spice" to drinks.