Hydroid Medusas were very large jellyfish-like creatures that were half droid and were used by Separatist forces in aquatic environments during the Clone Wars. During the Second Battle of Mon Calamari, Riff Tamson used several of these droids to combat Lee-Char and his allies.
Appearance

Hydroid Medusas were extremely large jellyfish-like creatures that had yellow heads and several tentacles that could release deadly amounts of electricity by the touch. They acted more as obstacles rather than direct combat units and had been khown to be very resistant to blasters, making them appear to be indestructible.
Appearances
- "Water War" (First appearance)
- "Gungan Attack"
- "Prisoners"