Locations: Hoover Dam, Legate Lanius' Camp
Enemies: Varying NCR enemies, varying Legion enemies, Praetorian Guard, Legate Lanius, NCR Ranger Veteran, General Oliver
This is it. Time to deal with the Legion and the NCR. You can either kill Legate Lanius or convince him to surrender with a series of speech checks (level 100 speech required), and the same is true of General Oliver. Both prove very difficult adversaries, especially with their pesky minions helping them.