Momenton

Momentons (originally Mass Bosons or Higgs Bosons) were force carrier particles responsible for the effects of mass. Momentons permeated the whole universe, creating an evenly distributed field. Particles with mass interacted with this field, giving them their properties, which included inability to travel at the speed of light. Massless particles and Hypermatter did not interact with the momenton field.

Momentons themselves also had mass, causing them to dissipate soon after their formation, maintaining a constant concentration of momentons in space. Manipulating the mass of momentons could change the nature of the field, making objects far more or less massive. This could occasionally be achieved using the force.