Lightning Reflexes is a heroic tier feat available to all player characters. It was changed from a paragon tier feat in the Player's Handbook to a heroic tier feat, and scaled at higher tiers, in the Essentials rulebooks.
Characters with the Lightning Reflexes feat gain a +2 feat bonus to Reflex defense.[PH:204] This bonus increases to +3 at 11th level and +4 at 21st level.[HotFL:316][HotFK:316]