Filius is a Filiusdrillo from the planet Fulmis in Ben 10:College Years.It is Fulmini's natural predator
It has the appearance of an Armadillo made of rocks,it is very intimidating.
It can change its shape and form into an giant rock ball.
Powers and Abilities
Resistance against Fulmini's natural electric abilities
The Ability to Turn into an ball made of rocks
The Ability to create earthquakes by just swinging its tail
Another Nemetrix User
The Big Reveal