The Striderpostor shielders are one of the variations the Striderpostors, being rare ones. Their legs are reinforced in comparison to other Striderpostors, and are bigger than the average.
They are commonly slower and less agile than other Striderpostors because of their extremly heavy legs. But they compensate this by having a high physical strenght and their most notorious ability: Being able to summon an energy shield that can tank a lot of attacks.
These shields aren't permanent tho, since if they're used for too long or they receive too much damage, the dispositive generating them is going to overheat or even be destroyed, thus weakening a LOT these units.
Crewmates are also capable of disabling their shields via EMP guns, but this still doesn't stop the brute force the Striderpostor shielders have.