Practiced Killer [Multiclass Assassin]

Benefit: You gain training in one skill from the executioner assassin’s class skills list. You also gain proficiency with ki focuses.
    Once per encounter, you can deal 1d8 extra damage with a weapon attack using a one-handed weapon, a garrote, a blowgun, or a shortbow. The extra damage increases to 2d8 at 11th level and 3d8 at 21st level.

Published in Dragon Magazine 400.