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 you by 50%. When you receive this perk in-game, you also receive a 30% discount at Craterside Supply, and Moira's Repair skill becomes 54 (72% condition). 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, talk Moira Brown out of writing the Wasteland Survival Guide. This will negatively impact your Karma, prevent you from earning the Survival Expert perk, but does not forfeit the achievement on consoles.

To obtain this perk you must start the quest. After this, ask about the guide and how you fit into it. Ask her about the research and tell her she doesn't know what she is doing. After that you must pass the speech check to complete this.