Hydroid Medusas were gargantuan jellyfish weaponized with cybernetic enhancements. These immense jellyfish incorporate armor and powerplants that turned them into near-unstoppable engines of underwater destruction. Separatist landing ships airdropped many hydroid medusas into the Mon Cala oceans during the Clone Wars, giving the Separatists the advantage in the civil war that erupted on the water world. Impervious to blasters and lightsabers, they wreaked havoc on underwater battlefields with their electrified tentacles. In the Battle of Mon Cala, the Gungan Grand Army used boomas to short-circuit the hydroid medusas.