From The Vault
Ninja is a Fallout 3 Perk.
The Ninja perk grants you the power of the fabled shadow warriors. When attacking you gain a +15% critical chance on every strike, only with either Melee or Unarmed. Sneak attack criticals do 25% more damage than normal. This perk is more suitable for players who follow a "ninja" play style, similarly to Grim Reaper's Sprint, which is suitable for players who follow play styles that use V.A.T.S. more often.
- To attain this perk you are only required to have an 80 Melee Weapons skill, even though the perk affects the critical bonus and sneak damage of both Unarmed and Melee Weapons. Thus, if you have an 80 or above Unarmed and Sneak skill, but only a 79 or below Melee Weapons skill, you would not be able to attain this perk.
- The extra 25% sneak attack critical damage and 15% critical chance only applies to melee and unarmed attacks. Attacks with ranged weapons are not affected by this perk in any way.
- The 15% critical chance bonus is not working as of patch 1.5.22 (tested on PC version). Versions 1.1.0 and above of the Unofficial Fallout 3 patch contain a fix for this bug. It does, however, appear to work on the PS3 version. (uncomfirmed)
.