Secutors are a product of thousand years of technical and scientific progress, incarnated in ultra hard steel. These combat machines are created and programmed for a highly efficient destruction. If a Scissor is one combat unit, a Secutor is worth a hundred.
Secutors coordinate Mechanoid units. They develop battle tactics and assign tasks. These machines are so dangerous, that it has been made impossible to produce any mechanism more complex than a Scissor on contemporary plants in case of seizure. In terms of military performance, Secutors are second best to Rethiarius.