Raging Storm

Heroic Tier
Prerequisite: Con 13, Dex 13
Benefit: You gain a +1 feat bonus to damage rolls when you use a power that has the lightning or the thunder keyword.
    At 11th level, this bonus increases to +2. At 21st level, it increases to +3.

Addition (7/28/2008)
Add the word "the" before "thunder" in 1st sentence of Benefits line.

Published in Player's Handbook, page(s) 200.