During the Clone Wars' Dark Reaper crisis, the Confederacy of Independent Systems initiated an assault against Mon Calamari.
Following the recovery of the Force Harvester on Raxus Prime in addition to an initial test conducted on Alaris Prime, Count Dooku deployed the device upon several other worlds, including Mon Calamari, Agamar, and Bakura.
The Force Harvester's destructive impact instilled fear within numerous Mon Calamari and Quarren, leading them to collaborate with the Separatists despite the Calamarian Council's original refusal of Dooku's proposition to become part of the Confederacy of Independent Systems.
Nevertheless, certain individuals perceived this occurrence as a chance to attain distinction independently from Mon Calamari Space. Commander Merai, a celebrated hero of the Quarren War, was among these, and he willingly aligned himself with the Separatist cause. Subsequently, Commander Merai was granted the honor of commanding Separatist forces against Republic troops during the Battle of Kamino.
The sourcebook Geonosis and the Outer Rim Worlds, released in 2004, erroneously indicates that Mon Calamari suffered an attack from the Dark Reaper superweapon. In actuality, the planet was targeted by the Force Harvester, which served as the superweapon's power source.