Beautiful and dangerous at the same time, the Hydroid Medusa is a cybernetically enhanced biological weapon developed by the Karkarodons of Karkaris. These immense jellyfish incorporate armor and powerplants that turn them into near-unstoppable engines of underwater destruction. Separatist landing ships airdropped many Hydroid Meduas into the Mon Cala oceans during the Clone Wars, giving the Separatists the advantage in the civil war that erupted on the water world.
A native of Karkaris, Riff Tamson agreed to lead the Separatist takeover of Mon Cala in exchange for control of the planet. To that end, he had Count Dooku and his Confederacy equip Karkarodon troops and transport massive Hydroid Medusas to the Mon Cala oceans.
The electrical tentacles and hardened armor of the Hydroid Medusas overpowered the Mon Cala and Republic clone troopers -- but the mechanical jellyfish proved vulnerable to the energized boomers of the Gungan Grand Army.
An important world in the Galactic Republic, Mon Cala was targeted by the Separatists who destablized the population with a civil war and unleashed Hydroid Meduzas to reinforce their invading army.