Smite Spirit Sharer (Su): Once per day per witch slayer level, you can smite a binder with a bound vestige or any creature possessed by another (by means of malevolence, a dual mind, or any similar ability) with a normal melee attack. You add your Charisma bonus (if any) to your attack roll and deal 1 extra point of damage per witch slayer level. If you accidentally smite a creature that is not either possessed or bound to a vestige, the smite has no effect, but the ability is still used up for that day.

Mettle (Su): Beginning at 2nd level, you can shrug off magical effects that could harm you. If you make a successful Will or Fortitude saving throw that would normally reduce (rather than negate) a spell or other magical effect, the magic has no effect on you at all. Any spell that is normally negated by a successful saving throw is unaffected by this ability.

Locate Possession (Su): By the time you attain 3rd level, you have attuned your senses to discern the presence of possessing forces. By concentrating for a full round, you can determine the presence or absence of any possessing mind within a 60-foot cone. By concentrating for a second full round, you can determine the location of the possessed creature or object. A possessing creature whose Hit Dice are higher than your character level can attempt a Will saving throw (DC 10 + your witch slayer level + your Cha modifier) to avoid detection. An opponent that succeeds on the saving throw has immunity to your locate possession ability for 24 hours.

Slippery Mind (Ex): At 4th level, you gain the special rogue ability slippery mind (PH 51).

Momentary Disjunction (Su): At 5th level, you can temporarily disable the spellcasting, spell-like, and supernatural abilities of a single creature within 30 feet as a swift action. If the target fails a Will saving throw (DC 20 + your Cha modifier), it cannot use spells, spell-like abilities, or supernatural abilities of any kind, as if affected by an antimagic field, for 1 round. Once you have used this ability, you cannot do so again for 5 rounds.

Multiclass Note: A paladin who becomes a witch slayer can continue advancing as a paladin.