Docilizing Boone on Legion's turf and lets Cass stick with you even if you're EEEEEEEEEEVIL.
Uploading Bafo's stuff with a perm for he named me his "legacy keeper".
As the "summary" says it lets you keep Boone and Cass as companions even despite you pecking their pet peeves, but does it in a more "role-playing manner".
With Boone, the dialogue options are changed that make it look like you're able to convince him that you're only cosplaying with Legion to get to Caesar's throat ( So he won't attack every Legion bean on sight ).
With Cass, the last "we gotta talk" momentum never triggers, instead living it on the prrevious "I'll give you a chance for now" (So basically she gives you the chance till the credits start rolling ).
As a bonus, this also alters Cass's random comments frequency, making her less of a mute (She has lots of random punchlines that before you had a very small chance of hearing, since the vanilla script prevented her from it ).
In conclusion, top of a morning to ya.
