Infernal Might

Heroic Tier
Prerequisite: Tiefling, any martial class
Benefit: When you use your infernal wrath racial power, if your next attack is a martial weapon power, it deals 1[W] extra damage. This extra damage increases to 2[W] at 11th level and 3[W] at 21st level.

Published in Martial Power 2, page(s) 136.