Fundamental Forces of Magic

The fundamental forces of magic are two binary, opposing powers that encompass all of existence. All power within reality can be attributed to these specific forces and their inherent traits. Until very recently, these were considered the only two forces in the universe.

Light
The power of light is the first fundamental force. It is well understood and documented, and is the basis for vanilla "white magic" in the world. Some attributes associated with light are fire, air, life and holiness. The souls of Acolytes are attuned to light, and ichorstone is associated with light. The gods themselves were considered to be the sentient beings made primarily of light itself. Attacks made of light are usually effective against creatures with attributes akin to darkness.

Darkness
The power of darkness is the second fundamental force. It is far more enigmatic than light, as the gods banned any study of its true nature. Darkness is the basis for "black magic" in the world, and often has negative connotations. Attributes of darkness are chaos, water, death, and untamed power. Noirstone embodies darkness, as do demons. It is speculated that a demon's anima is primarily made of darkness itself. In spite of its negative connotations, some wizards are rumored to have mastered dark magic without being tainted by its supposed ill effects. Attacks made of darkness are usually effective against creatures with attributes akin to light.

Blight, or Entropy
Blight is new to the world after the Coalescence. It is described by Iza as a "power born from the conflict of light and dark". Blight energy is created when pure light and pure dark are pitted against one another, but the energy itself is not a mixture of the two. It is entirely different, and transcendental in nature. Attacks infused with entropy are extremely effective against both light and dark.

When The Party was infected by the corrupted noirstone, blighted energy was likely created when the noirstone's darkness interfered with the light in their souls. This allowed members of the Party to generate their own small reservoir of blight energy. Upon meeting Iza, she gave them the ability to harness this energy by expending DP in battle.