Unlike most annoying but mostly harmless Parasprites, they tend to attack whatever is considerable edible (ie all that is made of flesh), including parasprites.
Citing Starswril: “These hideous creatures are a ruin! They can chew Crocadrille meat as if it iwere jelly, and their bite is highly harmful.
In contrast to these annoying little creatures, the Nightsprites have sharp teeth, a gray colour, four eyes and an incredible hunger for meat.
The only thing that does not seem to bear are fruits, vegetables and strong perfumes.
As well as gems and diamonds, so they have a sort of revulsion. “