After the Courier is asked if they are ready for the final fight and "yes" is chosen, they are moved to the Legate's camp. After some dialogue with the Legate, the Courier will storm the Hoover Dam, where their mission will be to kill the NCRGeneral Oliver. The fight consists of breaking through four areas of the Dam with the various factions the Courier had befriended into helping them. The Courier will confront General Oliver and with a Speech check of 100, convince him not to fight the Legion. If the decision is taken to kill Oliver, the player heads to the final area, a room full of traps with a platoon of NCR Veteran Rangers. The general then waits for the player in a room up the stairs with several NCR heavy troopers. The player then leaves the room after killing General Oliver and his men, unless he convinced him to leave, at which point Lanius congratulates you for it, and for winning the Second Battle At Hoover Dam, and then shortly after, the game ends.
On the last section where the Courier is confronting General Oliver, there are many soldiers. First of all, the Courier must make their way around the force fields. After you do this, proceed to the second level. On this level, the general's guards must be killed, but keep an eye out for the many traps. Both corners of the office room on the 2nd floor have frag mines concealed in them that cannot be disarmed; the middle office sections are full of rigged shotguns and high damage explosives. Furthermore, some of the guards here have been known to carry anti-materiel rifles, which can greatly complicate matters for an unprepared Courier. After killing the guards, proceed to kill the general. Leave the room and be congratulated for spilling blood by the Legate and the game will end.
Cross the dam and make your way to the western power plant.
(Optional) Take out the snipers who've taken up position in the western portion of the dam.
(Optional) Release the waiting Legion reinforcements inside the intake tower.
Find the enemy commander, General Oliver.
Kill General Oliver and the soldiers guarding him.
Return to the Legate and tell him that General Oliver has been driven off.
Return to the Legate and tell him that General Oliver has been killed.
Behind the scenes
"Veni, vidi, vici" is Latin for "I came, I saw, I conquered," and was Julius Caesar's description of the short Battle of Zela that he fought against Pharnaces II of Pontus.
If Arcade Gannon is following as a companion, he will leave upon arriving at the Legate's camp. Attempting to talk to him again will result in him saying "Why don't you make like Odysseus and get lost?" This is a reference to Homer's "The Odyssey" in which Odysseus treks 10 years across the Aegean Sea, trying to return to his home island of Ithaca following the Trojan War, but gets lost and side-tracked numerous times along the way.
ps3xbox360 After leaving the Legate's tent, the gate to the dam will not open and you are unable to fast travel thus you are unable to complete the Veni Vidi Vinci quest and finish the game.
ps3 When entering the Hoover Dam area with Rex and Cass or Rex and Lily as companions, both automatically go unconscious.
ps3 Raul randomly dies when attempting to enter Hoover Dam from the Legate's Camp. Waiting for an hour as soon as you walk through the door may prevent this.
ps3xbox360 The terminal to release the Legion Centurions inside the Hoover Dam Intake Tower 01 may not appear.
ps3xbox360 When on the second floor the game will freeze if trying to enter V.A.T.S. as soon as you walk up the stairs, though it may not if a valid target is present.
xbox360 Sometimes General Oliver will get stuck in the debris at the top of the stairs, the player cannot kill him at this point and sometimes this will also cause the game to freeze.
xbox360 If you choose to wait before entering legates camp, you might not be brought to the camp when you finally choose to go. Instead it will simply bring up the prompt, and then not do anything after choosing "yes".
ps3xbox360 During the confrontation with General Oliver, after killing him and all his guards the quest will not move on to tell you to exit the room. Despite searching every area for any lingering enemies no red tick(s) will appear. Simply load a save from before the conversation with General Oliver and try again.
ps3xbox360 After killing General Oliver and the rest of his troops, the game will prompt you to exit through the first floor. The game may freeze (leaving you inside the room) when activating the door.
pcps3 During the confrontation with Oliver and his troops the player must navigate through a room full of mines, tripwires, and other traps. If the player quicksaves and quickloads all the mines previously detonated will detonate again.
pcps3xbox360 It is possible for an NCR ranger to become friendly in the office trap area. He will flee from the player, making the objective of killing all NCR soldiers much more difficult.
pcps3xbox360 You may become stuck when trying to first talk to Lanius, as instead of the game reloading your location to the battle of hoover dam, you black in and out, and cannot move. May be caused by leveling up inside, or having Raul (or only Raul) as a partner following you inside at that time. Also, it may just randomly do it without leveling and reloading the beginning of the scene doesn't work to fix it.