Endmember

From Valwiki

The purest form of Oungmund in existence, Endmember is a term given to the most concentrated supply of Meridiallas' blood. It is found throughout the Bridger Sea as far north as the King's Coast and far far south as the Landtorn Sea, at extreme depths beneath the ocean or in remote locations of the Underdark. Endmember is observed as blue or violet in hue, correlating with the concept of being a more pure concentration of crystallized blood. Endmember is significantly more volatile than its counterpart, exchanging the capacity to hold more mana for an increase in speed and magnitude by which normal Oungmund effects apply. In short, it the equivalent of burning gasoline when compared to burning coal.