How to Use Them, the "Right Way"Edit
While the daggers are slightly weaker than real swords by at least one or two hearts, and have lower durability, they have a useful power. They have a strong attack when used behind the enemy. If the player sneaks behind the enemy (actual sneaking), then the daggers will apply a major backstab damage bonus. Better Dungeons Ninjas will also sneak to backstab. Tested once on single player: A pirate ninja on easy mode backstabbing a player in iron armor with an iron dagger will leave the player at 3 hearts. The Trickster and Ninja daggers are stronger than normal daggers, and have a special ability. If you sneak and right click, they use their power.
There are four types of daggers in Better Dungeons:
Craftable, made with iron
Craftable, made with diamonds
Drop from the Pirate Boss, right click while sneaking to create a clone of yourself (Hostile mobs attack the clones)
Drop from the Pirate Boss, right click while sneaking to teleport