The Slagged Centurion Spiderant acts much like its other Centurion cousins. The difference is it will spit out Slag instead of webbing at you. It will deflect most shots, save explosive-type, that are fired at its head mantle. It is also resistant to Slag-type damage. They can also do a short-range area burst around themselves of slag-type damage. Keep on the move to get at its weak point.
Aim for the butt!