Death Sense

Death Sense is a Fallout Tactics perk available only to deathclaws. So far it hasn't appeared in any other game.

You have developed superior senses. The perk gives you a +20% bonus to Perception while in the dark and a +25% bonus to detecting enemies using the Sneak skill. In reality the perk increases the perception of a Deathclaw by 2 permanently. You just have to be a Deathclaw to take this perk.