Unusual Essence

Unusual Essences were a type of Essence acquired during Diretide 2012 and Frostivus 2012. Up to three could be socketed into a single Greevil Egg, and each increased the intensity of the particle effect corresponding with the color of the hatched Greevil courier: the first imbued Unusual Essence resulted in a general aura effect, the second added a searing eye effect, and the third added a particle trail.