Nulli eggs are engulfed by an intense aura of negative emotions. Passerby creatures or humans with impure hearts will have their energy siphoned by this aura as a means to sustain the wicked creature within.
Folklore regarding the origin of the Nulli tells that the species is a malicious counterpart to the strong and prideful Cloverli. Said to be the unadulterated manifestation of hatred and jealousy, traits that Cloverlis notably lack, Nullis have an insatiable urge to destroy and conquer. Their sheer ruthlessness has allowed this species to claim reign upon a significant portion of The Fiery Shadows.
To compare someone to a Nulli is to say that they are an arrogant, envious, and heavily conceited person. The strong connotations associated with this insult has led to it becoming taboo to use in Arkian society.