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Abyssal Stalker (3.5e Feat)
From D&D Wiki
Abyssal Stalker [Racial]
Deadly and unseen the Tieflings are considered the zenith of the deadly arts, stalkers and assassins of The Abyss are widely feared.
Benefit: You gain +1d6 Sneak Attack damage and a +4 competence bonus on Hide and Move Silently checks.