Hammer Rhythm

Paragon Tier
Prerequisite: 11th level, Str 15, Con 17
Benefit: If you miss with a melee attack with a hammer or a mace and you wouldn’t otherwise still deal damage on the miss, you deal damage to your original target equal to your Constitution modifier. This damage receives no modifiers or other benefits you normally gain to weapon damage.

Published in Player's Handbook, page(s) 203.