Backstab

Backstab
Prerequisite: Sneak Attack, Melee BAB >= 2.
OR: Sneaky, Melee BAB >= 2.
Benefit: You are adept at making surprise attacks. You gain a +4 bonus on attack rolls when making a surprise attack (e.g., because the enemy is surprised, off-guard, flanked, exposed, charging, grappled, stuck or stunned).