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Avon shards are just naturally condensed Avon contained in a shard, originally they where giant Avonite gems that held unquestionable amounts of power, even the ancient's in their time never could understand their complete potential. over time these gems became so rare that many considered them a lost relic of the past leaving only the shards as evidence.

the shards Avon power can be used in anyway that the user wishes though it all depends on the shards size, the bigger the shard, the stronger it will be but in turn the welder as well must have a strong will to control such or else its power will whale out like a raging fire and lashing out its many years of condensed power.

currently in the early parts of the story, chaos Avonites have been collecting and mining the shards, keeping them on lockdown. lord bethal kazakrack thinks that if the other Avonite legions get hold of enough chards their rebelions could be much more of a threat towards him so for over 200 years he's  made it one of his main priorities to keep the shards away from most populations, he's only been unsuccessfully with the earth Avonites holding out in the mountain kingdoms of Sumjen.

Avon Gems are considered by many within the Avonite universe to be the rarest gem, throughout millions of years of the planet forming and moving with the tectonic plates, Avon essence's within the planet begins to solidify and slowly form into gems, though once formed they don't sustain their achieved state for long, once the ground begins to shift and the pressure builds on the gem it has a volatile reaction and shatters with an explosive intensity due to the built up Avon pressure.

from this explosion the surrounding area underground is covered with Avon shards, becoming safer to harvest for more practical uses. it is also still possible to find intact Avon Gems, mainly within places of submerged liquids, this is due to the area having little disturbance, allowing the Gems to be in a continuous undisturbed peace.