Silus

 is a member of Caesar's Legion captured during battle and brought to Camp McCarran in 2281.

Background
Silus was a centurion in Caesars Legion. During a battle with NCR force he chose to be captured instead of committing suicide, counting on being able to escape captivity without revealing any information about Caesar's plans. The player can try to interrogate him at Camp McCarran during an unmarked side quest.

Interactions with the player character
Silus is held captive in Camp McCarran, and the NCR is attempting to interrogate him. He will not give information to the NCR, and interrogator Carrie Boyd is looking for help. She informs the player that the NCR does not allow torture of prisoners. The player can suggest a truth serum, beating the prisoner, or calling him names.

If the player has a high enough reputation with the NCR, Lieutenant Boyd will allow the player to go in and speak with the Centurion. (Do not bring your companion into the room, as they could get stuck. If your companion is Boone, he will shoot at Silus). The player will go in unarmed, unless the player's sneak skill is high enough to bring in holdout weapons. The player can speak with Silus or attack him outright. Should the player speak with Silus, a high enough speech skill will result in the legionary attacking. If your intelligence is at 8 then you can persuade him into thinking that you are working with the Legion and are here to assassinate him, this will result in him telling you all of his plans. After a brief fight, Lt. Boyd will come in again and ask Silus if he wants more. When the legionary refuses, the player will briefly speak to him again, and begin attacking once more. After a second round of fighting, Silus will talk, letting the player know that Caesar is sick and that there is a legionary posing as a member of the NCR at Camp McCarran.
 * Alternatively, through a series of either Speech or Intelligence checks, you can get him to reveal the same info without shedding any blood.

After the information is gained from Silus, you can no longer interact with him, and Lieutenant Boyd will pay you for your troubles.
 * If you want to kill Silus after getting all of the information from him (and thus getting the reward from Boyd), you can place a live block of C4 in his inventory by pickpocketing him, if you have a high enough sneak score to get some C4 into the cell. After placing the C4 on him, you then interrogate him normally, collect your reward, then come back and blow him up at your leisure.  Killing Silus in this fashion advances your score with Boone.

If you leave the room after the first time you talk to Silus, you can not get back in, and further interaction with Lt. Boyd only result in her saying "Let's talk after we finish this up." and ending the conversation abruptly. There doesn't appear to be any way into the room at this point...

Setting Silus Free: If you have already been invited to Caesar's camp at The Fort, you can start your interactions with Silus by telling him that you are with the Legion. By doing this you can fake a fight and get him his weapon that he tells you is in the locker in the next room. After the fight when your sent back out get the weapon which is a silenced .22 pistol and when you go back in for the second round of interrogation she will take all your weapons except the pistol. You will talk to him and give him said pistol and he will fake being unconscious. Carrie Boyd will come back in and say it looks like he is all tuckered out and you and her will leave. On the way out she will tell the corporal to go clean him up and he will go in and tell Silus to get up. If you watch Silus will blow the Corporals head off and dress in his cloths. He will then sneak out and none of the NCR will know. You will not lose any rep. with the NCR because they won't know about it.

Note: After Silus is dressed as an NCR corporal he will not speak to you while he leaves.

Note: It is possible to pickpocket Silus' Centurion Armor once he is wearing the NCR uniform.

Appearances
appears in Fallout: New Vegas.

Bugs

 * If you reload an autosave after you enter the interrogation room, you will have all of your weapons with you while you interrogate him.


 * If you have a Silenced .22 Pistol you may be able to take it into the interrogation room. You can kill Silus with it (or by other means, such as Unarmed) and Lieutenant Boyd will not recognize his death. She will amusingly attempt to speak to Silus as if he is alive, but he won't respond. You will get your weapons back automatically when you leave the interrogation room, while Boyd talks to a dead Silus.


 * During the interrogation, if you have auto-save on, or save just as Boyd walks through the door (for me, she had just started to make her way to the door), the game bugs and you will be stuck in the room. Silus will not turn hostile and you will most likely have all your weapons still on you. However, Silus can still be beaten to the point of talking, and even killed, but the door will remain locked, and at no point will Boyd unlock the door, or even respond (she may even walk out of the room permanently). Reloading a different save fixes the bug, unless the save occurred in the above situation. However, each time you reload, certain aspects of the room might change, for example, Boone or ED-E may start in the room with you, Silus will automatically start hostile, or you will be caught in the door, unable to move. So far nothing has been proved to fix this save game ruining bug.

Options: *shoot Silus with a gun (my SNEAK was high enough or the game bugged out that       Boyd didn't take any of my weapons); then Boyd will come in and stop you from killing Silus... but when she leaves, you'll notice that the door is now unlocked. This allowed me to complete the quest. *use the noclip commandline cheat (TCL) then get out of the room and talk to Boyd. (untested) *open console (~), use the debug mode command "tdt" while in console mode click the door (on the upper part      of the screen you get "Door" (and some number - in my case it was 00172534), type in console "unlock 00172534" and voila,      the door is open.
 * If you successfully interrogate Silus during the conversation immediately after Boyd leaves the room, you can get stuck inside with no way of leaving the room. I completed the quest requirements by using the INTELLIGENCE path, pretending to be a Legion assassin but after Silus stops talking, nothing happens... the door is still locked and Silus won't talk to you anymore.