The Arachno is an enemy in Crisis Core -Final Fantasy VII-.
The Arachno will sometimes unleash its Super EM Field. Guard against this attack, then try to land some sword attacks from behind to inflict critical damage.
Arachne is the name of a mythological Greek weaver who boasted she had skills surpassing that of Athena, the goddess of weaving. For this hubris, Athena transformed her and her descendants into spiders.