Mana crystals are a solidified form of magical energy, that has precipitated in the high latent magic areas of the dungeons that exist in Araradrihl. Mana crystals precipitate in the core of dungeons, and are the essence of magic, they can be collected, and potentially sold for a good price. Removing the mana crystals from the core of a dungeon will cause the dungeon to become inert for an extended period of time as new mana crystals begin to precipitate out of the latent magic, causing the latent magic to become much less saturated than it was when the mana crystals were in place. Once out of their native latent magic field mana crystals will no longer be attuned with the magic aura and will no longer have any effect on the aura.
Mana crystals can be used as a substitute for manipulating latent magic, they are much more reliable, and can instantly be called on for use by caster touching them,