Lightning Soul

Prerequisite: 11th level
Benefit: You gain a +3 feat bonus to lightning damage rolls. This bonus increases to +4 at 21st level.
    In addition, whenever you take lightning damage from an attack, one enemy within 5 squares of you takes 10 lightning damage. This damage increases to 15 at 21st level.

Published in Heroes of the Elemental Chaos, page(s) 144.