How to obtain: killing a dragon
How they are made: when dragons are killed, all their life force gets condensed into one location near their heart.
Qualities: the core can absorb energy from it's surrounding. Once enough energy is stored, the dragon can come back to life if the core isn't removed in time. The core is also capable of enhancing elemental attacks depending on what type of dragon it is.
Uses: often used as a good luck charm for jeweries for elites. Many forge masters also use them to make fine weapons. The higher the grade of the core, the more powerful the weapon can be. The core can also act as a bomb if given the right condition. It is also highly capable of absorbing mana, curing mana sickness from excess mana.
Sort of core: fire dragon core, lightning dragon core, stone dragon core, ice dragon core, alpha variations, Arch variations.