Assault Armor is a Methridian technology. It is made out of refined Iron Plant, and shaped into whatever form required to suit their needs, and filled with Methrids. It has a mineral inside that the Methrids send electric bursts through, to generate a hovering effect, though not all are equipped with this.
An example type of armor would be the armor worn by infantry. It is claimed to be impenetrable to most kinetic weapons, though energy weapons can pierce it. Most of the methrids must be killed before it stops moving.