Alternatively, a Speech check of 75 will provoke Karl to reveal his true feelings about the Khans. If this is done in the longhouse, the Khans inside will kill him.
Convince Papa Khan to sever the alliance.
Pass one of two Speech checks of 75; urging them to claim their glory will cause the Great Khans to flee the Mojave during the Second Battle of Hoover Dam, while urging them to be martyrs will prompt them to perform a suicide attack on the Legion during the battle.
If you use Speech checks to disgrace Karl instead telling Papa Khan about the journal, you will be unable to use his journal as evidence to gain Regis' support. In that case you have to use the slave ledger to persuade Regis.
If, at the end of the quest, you ask Papa Khan to ally with NCR and then tell him to stick around, the quest will remain open for you to solve via talking to Regis/Colonel Moore and assassinating Papa Khan.
If all the commanders in Forlorn Hope are assassinated for the quest We Are Legion, Papa Khan will inform you that upon his death the player will become the new chief. Killing Papa stealthily when he goes to bed, allows you to be the new Papa Khan. Reporting to Regis and telling him whom the Khans are to ally with will result in Khan fame and completion of the quest.
Halfway through the quest, you may be randomly attacked several times by two legionnaire recruits who say "Karl sends his regards" if you fast travel to and from the Red Rock Location. They hide behind rocks at the bottom of the hill to the longhouse.
PCPlayStation 3Xbox 360 If you trigger the dialogue where Papa refuses to break the alliance with the Legion before this quest is started, the option will not come back, as it seems to be a one time dialogue option This locks the quest and is unable to be completed.
PC The console command resetquest 00140c3a will bring back all of the dialogue options needed to trigger Regis although some of them may still be "grayed out" cycling through all of them normally will allow the encounter with Regis outside of the longhouse.
PCPlayStation 3Xbox 360 A marker is not placed at Caesar's tent to get evidence for Regis, nor does obtaining Karl's journal complete the objective.
PCPlayStation 3Xbox 360 Stealing Karl's Journal from his footlocker and then killing him will disable you from using it as evidence against the Legion for Regis, making the slave ledger in Caesar's tent the only usable proof you can use.
PCXbox 360 If you use Speech checks to get Karl to reveal his true feelings about the Khans, resulting in his death, "For the Republic, Part 2" will update to inform you that you've killed the Khans even though none are dead. This will likewise happen if you convince Papa Khan not to side with the Legion while Karl is still in their good graces, as they will again kill him. To avoid this bug, steal Karl's journal (it's in the footlocker in the furthest room from the table) and show it to Papa Khan. Karl will die, but the quest will proceed as normal.
PC If Julie Farkas somehow ends up dead, the quest will be impossible to complete via the book, even if you head to Trading Post 188 and kill Ezekiel for the book. The only way around this is to convince Papa via the speech option.
PC Offering to find proof of female enslavement for Diane will override Regis' quest target, so completing it will also meet his requirement. Convincing Jack through Speech afterward will get all three characters' support, making the trip to Cottonwood Cove unnecessary.
Xbox 360 If the player convinces Papa Khan to break the Great Khan's allegiance to the Legion, random non-player character chatter after completing the quest will still talk about how the Great Khans were "destroyed" and "massacred," even though a peaceful solution was found.
Xbox 360 You may get the dialogue option to show Regis Karl's journal as evidence without actually finding it first.