Your weapon surges with lightning like the blue dragon's horn. As you rage, the spirit of the blue dragon courses through you, and your blows erupt in bursts of lightning.

Daily   ✦     Lightning, Primal, Rage, Weapon
Standard Action      Melee weapon

Target: One creature

Attack: Strength vs. AC

Hit: 5[W] + Strength modifier damage, and ongoing 10 lightning damage (save ends).

Miss: Half damage.

Effect: You enter the rage of the blue dragon. Until the rage ends, once per round when you hit a target with a melee attack, each enemy adjacent to that target takes 10 lightning damage.

Published in Player's Handbook 2, page(s) 60.