Heir's Mark: Levels in the shadow hunter prestige class count as levels in the dragonmark heir prestige class when determining the caster level for the spell-like abilities of your dragonmark. You can have a maximum of five effective levels in dragonmark heir for the purpose of determining the caster level of your dragonmark.

Improved Darkness (Ex): You can use the darkness power of the Mark of Shadow an additional number of times per day equal to your class level.

Deeper Shadows (Ex): From 2nd level on, when you use the darkness power of your dragonmark, you can expend a second use to enhance its power. This produces an effect identical to deeper darkness that lasts for 24 hours or until dismissed.

Poison Use (Ex): From 2nd level on, you are trained in the use of poison, and never risk harming yourself when applying poison to a weapon.

Shadow Sense (Sp): At 2nd level, you gain an uncanny ability to sense members of your bloodline. To activate this power, you expend one use of any of your dragonmark powers. Thereafter, for the duration of the effect, if you come within 30 feet of a character who possesses the Mark of Shadow, you can sense his location and the level of his mark.

This effect even allows you to pinpoint the location of invisible characters, although an invisible opponent still gains the benefits of concealment (20% miss chance). Misdirection is effective against your shadow sense, but you gain an insight bonus on your saving throw equal to your class level.

The duration of the effect is based on the strength of the dragonmark whose power you expend.

Dragonmark	Duration
Least	10 min./class level
Lesser	1 hour/class level
Greater	24 hours

Though it originally allowed allied shadow hunters to avoid accidentally attacking each other while fighting in magical darkness, this ability now allows shadow hunters to detect the presence of those of the opposing House of Shadow.

Shadowblind (Sp): At 3rd level, you learn to use darkness as a weapon, blinding your enemy within a cluster of shadows. Using shadowblind is a standard action that provokes attacks of opportunity, and requires you to expend one use of your darkness power. Target a creature within 50 feet. That creature must make a Will save (DC 10 + your class level + your Cha modifier) or be blinded for 1 minute.

Shadowsight (Sp): At 4th level, you can call on the power of your dragonmark to pierce the deepest shadows. To activate this ability, you expend one use of any of your dragonmark powers. For the duration of the effect, you gain darkvision with a range of 60 feet, and can ignore the effects of darkness and deeper darkness. The duration of the effect is based on the strength of the dragonmark whose power you expend.

Dragonmark	Duration
Least	10 min./class level
Lesser	1 hour/class level
Greater	24 hours

Cloak of Shadows (Sp): At 5th level, you learn to wrap yourself in shadows, concealing yourself from your enemies. Using cloak of shadows is a swift action that does not provoke attacks of opportunity, and requires you to expend one use of your darkness power. You gain concealment (20% miss chance) for 1 minute per level, at the same caster level as your other dragonmark powers. In addition, you can use the Hide skill even while being observed.