Pass for Human (Ex): At 1st level, when trying to conceal her half-orc heritage, a skulking slayer gains a bonus on Disguise checks equal to half her level. When using disguise to appear as a specific individual, skulking stalkers ignore the normal –2 penalty to appear as another race.
Underhanded Maneuvers (Ex): At 1st level, when she could normally make a sneak attack, a slayer may instead make a dirty trick or steal combat maneuver with a bonus on her roll. This bonus is equal to her number of sneak attack dice for a dirty trick combat maneuver, or 1-1/2 × her number of sneak attack dice for a steal combat maneuver. This ability replaces trapfinding.
Painful Strike (Su): At 1st level, when you confirm a critical hit, the target is sickened for 1 round. During this time, the creature must succeed at a concentration check (DC = 15 + the spell’s level) in order to cast a spell.