Fatigue (Fallout: New Vegas)

Fatigue is a derived statistic in Fallout: New Vegas.

Fatigue is similar to Hit Points - but instead of causing death upon its depletion, the NPC suffers a knock out (KO) and becomes unconscious.

Mechanics
If an NPC suffers enough Fatigue damage to reduce their Fatigue to 0 or below, the value is immediately set to -30 and the NPC will enter a state of unconsciousness. Additional Fatigue damage can still be applied to a KO'd NPC, but it cannot lower the value below -30. While in this state the NPC cannot move or react, but is still considered alive and can suffer normal damage to the point of death. Unlike unconsciousness in Fallout 3, "fatigued" or "knocked out" NPCs cannot be looted; any attempts to interact with them will fail with the message " is Unconscious".

The Fatigue stat is determined by a base fatigue and modified by the NPC's Endurance and Level, as shown by the formula below. The approximate average Fatigue rating for humanoid NPCs is 250. Fatigue's base regeneration is 1 per second, meaning that NPCs will naturally recover from a knockout in 30 seconds.


 * $$\text{Fatigue}=\text{Base Fatigue}+(\text{Endurance}\times20)+(\text{Level}\times10)$$

For some weapons, if a target cannot be fatigued they instead deal some additional damage.