Sicarian Infiltrators are lithe, unnervingly fast battle-automata built by the Adeptus Mechanicus for infiltration and disruption behind the enemy's front. Where their Ruststalker cousins are pure close-combat killers, Infiltrators are hunters of coordination itself, equipped with weaponry and arcane systems that scramble communications, jam targeting, and unpick the careful order of a defending force.
Moving with a jerky, spider-like grace that betrays the crushed human mind buried within each shell, they slip through gaps in a line to appear where they are least expected, cutting down officers and specialists with flechette blasters and taser weapons. The confusion they sow is as valuable as the blood they spill, leaving an enemy fighting half-blind and out of step while the wider Mechanicus advance closes in. To face Sicarian Infiltrators is to feel the battle slipping out of your control before a single shot has been fired in earnest.