Ninja

Ninja is a Fallout 3 Perk.
 * Requirements: Level 20, Sneak 80%, Melee Weapons 80%
 * Ranks: 1
 * Benefit: The Ninja perk grants you the power of the fabled shadow warriors. When attacking with either Melee or Unarmed, you gain a +15% critical chance on every strike. Sneak attack criticals do 25% more damage than normal.
 * Note: Even though the description doesn't explicitly state it, the 25% extra damage only applies to attacks made with melee or unarmed weapons.