The Aristrix is a device similar to the Omnitrix, ordered by Vilgax and created by Ar'Ghoz with the purpose of going against Ben. Made exclusively for combat, the Aristrix contains 11 enhanced alien DNA samples. The user can stay transformed for as long as they want and there are blades in the joints of the fingers so the user, even untransformed, can fight.
All aliens stored in the Aristrix are genetically modified and some have abilities that their original species does not possess. For example, Aristrix's Pesky Dust can release energy blasts, something the original cannot do. All this to make the aliens more viable for combat.