Agrios

Agrios is a gigantic powerful homunculus monster that was created by the Fearcats after they mixed three rare, and powerful artifacts (Minerva's Staff, The Root of Hesper, and The Sands of Sila) inside the Octavian Chalice after stealing each of them from Moltor, Flurious, and Kamdor. While not technically a robot in the traditional sense as most of the Fearcats' other creations, the Fearcats were able to harness the monster's abilities like a giant robot after they attached their own robotic armor to it to power it up. The DriveMax Ultrazord clashed with Agrios but wasn't able to defeat it. Then the Battlefleet was summoned and turned into the BattleFleet Megazord followed by the Sentinel Knight, but none of them were able to defeat Agrios. Agrios even attacked the other villains (Flurious regretted to admit that he and the other villains wouldn't have a choice to submit to the Fearcats later on because of Agrios). Mack Hartford used the Flashpoint Megazord to fight Agrios. The Zords were eventually repaired just in time to help Mack. All three Megazords engaged Agrios. While wielding the Sentinel Sword and riding the Battlefleet ship, Agrios was finally destroyed by the DriveMax Megazord.