|LEGO → System → Exo-Force|
The set consists of the Battle Arachnoid, a six-legged battle machine piloted by a single Devastator. Like many other Exo-Force sets released that year, it features a detachable brick-built mini-robot built into the model's design, which can snap off and be used independently. The cockpit of the Battle Arachnoid can detach to form a small flying craft, referred to as a Grav Runner.
The Battle Arachnoid was created as a replacement of the Shadow Crawler, as the latter was unable to travel through the dense - and living - forest by the Golden City.
- Official images and the instructions' part list (booklet 2, page 14) suggest the skull is meant to go inside the mini-robot's green tank, but the instructions themselves (booklet 2, page 10) put the skull in the Grav Runner's tank instead.
- Although officially part of the Exo-Force theme, this set is represented in 4850307 LEGO Battles by the Alien army from Mars Mission, which features the Builder, Laser Trooper, and Grav Runner derived from this set.
- In 55000 LEGO Universe, the Spider Boss's legs are modeled after the Battle Arachnoid's legs.