Natural Heritage (4e Feat)
From D&D Wiki
Natural Heritage [Dragonborn]
Channeling the dragons you slew with your resonant origin, you power your sigil.
Prerequisite: Dragonborn, Dragoon, dragon breath racial power
Benefit: If your sigil power type and your dragon breath power type are the same you can add an extra 1d6 damage of that type every time you activate your sigil on your weapon.