Mythslayer

This +5 heavy crossbow deals 2d10 damage on hit. If its target has one of the following qualities: Huge or Gargantuan size; dragon subtype; giant subtype; 20 or more HD, it inflicts a single -2 penalty to wielder's attack rolls, but adds 1d10 to damage for each of the qualities the target has.

Every legend has an end. More than one have ended with a bolt shot from this crossbow.