Dream Crusher

Dream Crusher is a Fallout 3 special perk. It cannot be gained by leveling up, but only through dialogue.

This perk reduces an enemy's chance to critically hit the player character by 50%. When the Lone Wanderer receives this perk in-game, they also receive a 30% discount at Craterside Supply, and Moira's Repair skill raises to 72% condition (from 54%). This perk does not in itself grant these bonuses (her dialogue checks the quest stage of the Wasteland Survival Guide instead of the presence of this perk).

Obtaining
To obtain this perk, the Lone Wanderer has to convince Moira Brown not to write the Wasteland Survival Guide. This will negatively impact Karma, and prevent the Lone Wanderer from earning the Survival Expert perk, but will not forfeit the achievement on consoles.

The quest must have been started to obtain this perk. After that, Moira should be asked about the guide and how the Lone Wanderer fits into it. They have to ask her about the research and tell her she doesn't know what she is doing. After that a Speech check must be passed to complete this.