|Although this article is based on canonical information, the actual name of this subject is conjectural.|
The Gavrok Box Spiders were a species of spider-like demons contained within the Box of Gavrok. Ingestion of several of these creatures was required to achieve Ascension into the embodimient of the demon Olvikan.
The Gavrok Box Spiders were black, had eight legs, beetle-like bodies and relatively small to humans. They were fast, could scale up walls and kill humans by striking at their face. However, they were fairly easy to kill; this was shown when Buffy Summers was able to crush one by simply dropping herself, back-forward onto the spider.
According to Richard Wilkins, these spiders were high in fiber.