Legionary Assassin

 are high-end assassins living in the Mojave Wasteland in 2281. They work for Caesar's Legion and travel in packs.

Background
They are assassins for Caesar. You will first find them on your way to Novac, and they will attack you if you kill the Caesar's Legionnaires and Vulpes Inculta at Nipton. The Player may encounter a squad of three legionary assassins if they are at a status of "Shunned" or worse with Caesar's Legion. This may also occur after aiding the Legion's enemies, namely the NCR, by successfully completing the quests Three-Card Bounty, I Put a Spell on You, I Don't Hurt Anymore, or any other quest that improves the reputation of the Player with the NCR. Legionary assassins can spawn anywhere in the wasteland upon the players arrival in that area and will attack any enemy force upon sight, similarly to the Regulators and Talon Company in Fallout 3.

Legionary Assassin parties can also be found attacking trading outposts or NCR garrisons like the 188 Trading Post without actively attacking the Courier (if he/she is Neutral or Ally with Caesar's Legion) unless engaged.

They are equipped with Legion Recruit Armor and Legion prime armor and carrying weapons like Machetes, 9mm SMGs and 10mm SMGs, and often the more powerful variety such as 12.7mm pistols, 12.7mm submachine guns, brush guns, trail carbines, super sledges, and Thermic lances when the player is at higher levels. They are often led by a Caesar's Legion Vexillarius equipped with Legion Vexillarius Armor, Vexillarius helmet, and a Sniper rifle. As of patch 1.4.0.525 some of the assassins are equipped with Legion Centurion Armor making them all the more difficult to kill.

Appearances
Legionary Assassins appears in Fallout: New Vegas.

Bugs

 * Due to a large number of quest script errors, Legionary Assassins will not reappear after their initial attack, and furthermore may not initially appear at all depending on circumstances.
 * A third-party bugfix has been released which corrects this issue.
 * They may occasionally be found setting up ridiculously inadequate attempts at ambushes (such as standing in the middle of the road at Novac staring in one direction), making it easy for the player to walk up behind and get the drop on them.
 * Sometimes Legionary Assassins may reappear every once in a while.