Dagger damage

Double damage figures from a single attack means that the attack had two different damage rolls (usually, but not always, of different elements). Many high-level weapons of all types have two or even three damage rolls.

Blessdags have only one damage roll, 12-18 neutral. Daggers that "hit" more than once include Citrus Daggers (level 113), Dagg'Adou (level 175), and Ice Daggers (level 150), just to name a few.