Arachne

Arachne is a sub-species of Tarratect with the upper body of a human and a spider for a lower body; what kind depends on what species it was before evolving. It is a special evolution available exclusively to small-to-medium sized Teratects that are at least level 50 and possess the Pride Skill.

Monster File
A monster with no confirmed sightings in recorded history. As such, there is little to no information about it, and it is shrouded in mystery. It is said that the human part of the monster's body has the appearance of an exceptionally beautiful girl, but this is only a rumor, the truth of which is unknown. Because there are so few witnesses, it is questionable whether this monster even exists at all. The only sightings occurred during periods in which the Nightmare of the Labyrinth or a Nightmare's Vestige were also sighted, so it is thought that witnesses may have simply mistaken them for this creature. Because it's very existence is in doubt, it is impossible to measure the danger level of this monster.

Synopsis
Realizing it would be impossible to communicate with humans in her spider body, Kumoko makes her long-term goal to evolve into an Arachne, hoping that having a human torso might make her more appealing.

Powers & Abilities
The abilities of an Arachne appear to depend heavily on what species it was before evolving, the traits of which the spider half inherits. Overall, the evolution does not give any unique skills and merely offers an increase in stats. In fact, they might even lose some skills should they be incompatible with the body structure. However, in turn, Arachnes do possess some of humanity's unique traits through their the human half, like being capable of speech and equiping items. Also, having both a human and spider body gives it a unique field-of-vision and if one were to be destroyed the other can continue operating on its own just fine.

Trivia

 * It is mentioned that this monster actually has two brains, one for the human body and one for the spider body, and both are able to take over the other's functions if destroyed.
 * After evolving into an Arachne, Kumoko lost the Swim skill she had as a Zana Horowa for some reason.