The Black Onyx acts as the Black Obelisk's protection as it is equipped with a particle defence system. It is introduced in the mission Crystal Calamity, where Kindle explains that in fifty minutes, the barrier field will be operational. Once the barrier is in place, the black obelisk will be indestructible, shielding it from all attacks. As such, the Allied Nations are forced to use specially designed anti-satellite missile silos to destroy the Black Onyx's shield. By successfully using all nine missile silos scattered throughout the battle field, the Allied Nations are successful in destroying the Onyx.
- "What you see is more than 22,000 miles above us, in outer space. That glistening ebony star you see is Black Hole's ultimate weapon. Tremble before our magnificent battle satellite, Black Onyx!" —Kindle (Advance Wars: Dual Strike)
- "Black Onyx is equipped with a state-of-the-art particle defence system. The barrier field it projects shields the black obelisk from fire. Our first order of business is to take out the Onyx and drop that shield." —Rachel (Advance Wars: Dual Strike)
- "Black Onyx is the black obelisk's guardian angel. In a mere...fifty minutes from now, its barrier field will be operational. Once it's in place, the black obelisk will be safe for all eternity!" —Kindle (Advance Wars: Dual Strike)
- "Allow me to explain. The missiles here are specifically designed to seek and destroy satellites. They're part of the ASDS--our anti-satellite defence system." —Lash (Advance Wars: Dual Strike)