Sprightly Armor (Armor Mastery, Combat)Source Armor Master's Handbook pg. 17
You make the most of your armor’s magical capabilities.
Prerequisites: Dex 13, base attack bonus +11 or fighter level 8th, armor training class feature, proficiency with light armor.
Benefit: You add your armor’s enhancement bonus as a bonus on your initiative checks.Source Armor Master's Handbook pg. 21 (Amazon)
You can spend 5 stamina points as an immediate action to gain a circumstance bonus on your Reflex saves equal to your armor’s enhancement bonus for 1 turn. (See page 17.)