Sicarian Princeps

A Sicarian Princeps is an officer of the Adeptus Mechanicus' Skitarii cybernetic soldiery who commands squads of the Skitarii specialists known as Sicarian Ruststalkers and Sicarian Infiltrators.

There are two kinds of Sicarian Princeps, Ruststalker Princeps and Infiltrator Princeps, and each has a different wargear loadout.

Wargear[]

As standard, Sicarian Ruststalkers are armed with:

Sicarian Battle Armour - As agility is of paramount importance to the long-limbed killers of the Sicarian brotherhood, Sicarian Ruststalkers go to war clad in Sicarian Battle Armour. This is made up of a multi-layered alloy that, though thin and flexible, provides admirable physical protection. This alloy, informally known as aegium, acts as a capacitor that harnesses the energy of incoming attacks and disperses it harmlessly across the wearers bionic frame.
Transonic Razor - A Transonic Razor emits a low, insistent buzz that makes stomachs turn and eyes vibrate in their sockets. When they strike armour, these weapons will adjust their hostile sonic field to match the armour's resonant frequency, quickly slicing right through it
Chordclaw - A Transonic Weapon in the form of a needle-fingered gauntlet capable of turning a man's muscle, bone and fat to jelly.
Mindscrambler Grenades - Mindscrambler Grenades harbour the egg-sac of a Cthellan electrogenesis squid. When detonated, the resultant surge of bio-electricity causes heavy neural trauma in living creatures and artificial sentiences alike.

All members of a Sicarian Ruststalker squad can choose to replace their Transonic Razor, Chordclaw, and Mindscrambler Grenades with:

Twin Transonic Blades - Stiletto-swift weapons wielded in pairs, Transonic Blades are a form of Transonic Weapon that augments the user's own strength to devastating effect.

Optional wargear that a Ruststalker Princeps can take include:

Chordclaw - A Chordclaw can be taken if the Ruststalker Princeps chooses to wield twin Transonic Blades.
Prehensile Dataspike - Usually mounted on a tail-like Mechadendrite, the dataspikes favoured by the agents of the Adeptus Mechanicus can stab into the cortex of enemy machines and steal their secrets within a couple of heartbeats.
Relics of Mars - Relics of Mars are items of terrifying power that are sometimes bestowed upon a Skitarii Alpha or Sicarian Princeps by a senior Tech-Priest for them to field test.
Special Issue Wargear - Elite Skitarii warriors have the right to bear special issue wargear into battle, which can include either a Conversion Field or Refractor Field, and Digital Weapons.

As standard, all Sicarian Infiltrators are armed with:

Sicarian Battle Armour - As agility is of paramount importance to the long-limbed killers of the Sicarian brotherhood, Sicarian Infiltrators go to war clad in Sicarian Battle Armour. This is made up of a multi-layered alloy that, though thin and flexible, provides admirable physical protection. This alloy, informally known as aegium, acts as a capacitor that harnesses the energy of incoming attacks and disperses it harmlessly across the wearers bionic frame.
Stubcarbine - A Stubcarbine, though compact, has the stopping power of the Heavy Stubbers mounted on the tanks of the Astra Militarum. When a squad of Sicarians opens fire with these weapons, the air fills with a storm of solid shot that chews their victims to ruin.
Power Sword - A Power Weapon is sheathed in the lethal haze of a disruptive energy field that eats through armour, flesh and bone with ease.

All members of a Sicarian Infiltrator squad can choose to replace their Stubcarbine and Power Sword with:

Flechette Blaster - A Flechette Blaster is a lightweight but lethal weapon, a favoured tool of Sicarian Infiltrators. It fires hundreds of tiny darts, each of which bears a dormant cerebral cell awakened in the gun's chamber. Where one dart hits home, it emits a bioelectric pulse that attracts others, resulting in a series of impacts that burrow through bone.
Taser Goad - Powered by hyperdynamo capacitors, Taser Weapons store an incredible amount of potential energy. A solid impact will cause this energy to be discharged in a scorching blast, only to be harnessed once more by the electrothief prongs at the weapon's tip.

Optional wargear that an Infiltrator Princeps can take include:

Infoslave Skull - The dextrous skull-and-digit adjutants that accompany senior Skitarii record hard data at a prolific rate. To know their findings are recorded and reported back is a great boon to the Skitarii, who draw courage and strength from the fact their sacrifices will not be in vain.
Relics of Mars - Relics of Mars are items of terrifying power that are sometimes bestowed upon a Skitarii Alpha or Sicarian Princeps by a senior Tech-priest for them to field test.
Special Issue Wargear - Elite Skitarii warriors have the right to bear special issue wargear into battle, which can include either a Conversion Field or Refractor Field, and Digital Weapons.

Codex: Adeptus Mechanicus (8th Edition), pp. 50-51, 79
Codex: Adeptus Mechanicus - Skitarii (7th Edition), pp. 27, 32, 34-39, 59, 66, 75-78