This unit appears once the Republic advances to the third stage of Galactic Assault on Geonosis. In this stage, the Republic must escort their remaining AT-TEs to a staging ground guarded by Separatist forces. Several OG-9 Homing Spider Droids can be found around the staging ground. They stay in place and automatically target and damage AT-TEs that are near them, but they do not attack anything else. They can be damaged and destroyed by AT-TEs as well as Republic troops.
The Homing Spider Droids deal significant damage to AT-TEs with their beam cannons, so Republic players should try to destroy these stationary vehicles as quickly as possible. They do not defend themselves, so Republic players do not need to worry that these units will attack them if they get close. Separatist players can try to defend their Homing Spider Droids, but since they are so exposed they cannot really be defended against from AT-TEs, which have long range weaponry that can destroy the Homing Spider Droid in a few shots.
Land: STAP · AAT · MTT Capital ships: Providence-class Dreadnought · Lucrehulk Battleship