Lethal Shroud is a Heroic Tier feat available to Assassin's with the assassin's shrouds power
Your intense emotional focus has empowered you to take greater advantage of your assassin's shrouds.
Benefit:The damage dealt per shroud when you invoke your shrouds increases from 1d6 to 1d8. This damage increases to 1d8 + 5 at 11th level and 1d8 + 10 at 21st level.