Gray Matters

Gray Matters is a perk cut from the Fallout 3 add-on Point Lookout. It doesn't appear in the game and can only be obtained with console commands.

Effects
Initially, it was to reduce damage to the head by 25% but due a bug, it is significantly higher.

Behind the scenes

 * The term "gray matter" is used for one of the two major components of the central nervous system (along with white matter).

Bugs

 * Although the description for this perk states that it will reduce head damage by 25%, the effect of the perk instead reduces head damage to 25%, or in other words a 75% reduction in head damage.