Fallout: New Vegas Cheats :
Secret - Bring your Mojave followers with you in the DLCs!!!
There is a way to make your followers from the Mojave join you in the DLCs.
1- You'll HAVE TO do the multiple followers glitch. The glitch is, in a nutshell, have Veronica as a follower, after visiting specific places she'll start a conversation with you tell her "not now" and then fire her. Go recruit another humanoid follower, then return to the 188 trading post and speak with Veronica. Choose the option "what did you want to talk about earlier?" and tell to go by herself to the hidden valley TWICE. That will open up another slot for a humanoid follower, go recruit someone else and rinse and repeat to get as many followers as you please.
2- Choose a DLC mission, go to the destination on your map. When you'll be "transported" to the DLC area you'll lose 1 or 2 followers, but the others will join you once the opening scene of the DLC is completed.
3- Once you have finished the DLC, if only one follower was fired you can go back to where he/she is and re-hire him/her on the spot. If 2 were fired then you'll need to fire Veronica and repeat the dialogue pattern with her to open up a slot for that 2nd follower.
NOTES: The way the glitch works in Dead Money and Old World Blues is that the game will automatically fire 1 or 2 of your followers when you'll be "transported" to the DLC area. In Honest Hearts you'll be forced to manually dismiss your followers in order to continue. However, you only need to fire your "active" follower(s), which is what the game does automatically with the other 2 DLCs. Your extra followers aren't considered "active" which is what causes the glitch in the first place. One way to find out which followers are active is to go to the Lucky 38 penthouse, the area is for the player only and your "active" followers aren't allowed up there, so the ones that WILL follow you to the penthouse are also the same ones who will follow you to Zion. For those who might not have access to the penthouse you can save your game before firing your follower, then speak with Jed to see if the one you fired was the "active" one, if not then fire another and talk to Jed again until you have the option to continue with the questline. Then simply reload and dismiss only the last follower you fired.
This can be further exploited in Dead Money, since all your gear is stripped from you at the start of the DLC, you can simply stash your gear on a follower and retrieve it once you've arrived at the Villa. That way you won't have to worry about conserving ammo or stimpaks, and with the extra followers it will make exploring the Villa much easier.
If you need more information about the multiple followers glitch using Veronica, i have submitted a detailed walkthrough for that glitch, check out the other cheats for FNV.
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