Grace Of Ghallanda [Dragonmarked]

The power of your dragonmark fills you with social grace, and diplomacy becomes your shield.
Prerequisite: Any Mark of Hospitality.
Benefit: As an immediate action, you can spend 1 action point to oppose any attack roll made against you with a Diplomacy check. The decision to spend the action point can be made after the attack roll result is known. If your Diplomacy check meets or exceeds the attack roll result, the attack misses regardless of your Armor Class.
The number of times per day that you can use this feat depends on the strength of your dragonmark.

Dragonmark	Times/Day
Least	1
Lesser	2
Greater or Siberys	3

Source: Dragonmarked