The Arachnina is Nina's mech suit, which is half-robot, half-spider. It has all the weapons in the Cortex family arsenal, in particular a laser beam and a saw-blade. When Nina fought Crash Bandicoot with this arachnid terror, Crash used the robot against her by jacking it, and destroying the Doominator (in the PS game). To jack it you have to jack a Battler or a Rhinoroller to jack the Scorporilla and then use the Scorporilla to jack the Arachnina.