Dream Crusher

Dream Crusher is a Fallout 3 perk. It can't be gained by leveling up, but only through dialogue.

Reduces an enemy's chance to critically hit you by 50%. Having this means you also get a 30% discount at Craterside Supply, and an increase in Moira's repair skill.

Obtaining
To obtain this perk, talk Moira Brown out of writing the Wasteland Survival Guide. This will negatively impact your karma (and prevent you from earning the much stronger Survival Expert perk).

To obtain you must start the quest after this ask about the guide and how you fit into it. Ask her about the research on the top and tell her she doesn't know what she is doing after that you must succeed the speech challenge to obtain it.