|"That's not what happened at all!"
This topic is considered non-canon because it never appeared in the TV series.
The Double-Bladed Dagger is a weapon from Ninjago, associated with the Ninja. It is a silver dagger with large, triangular spike-like blades on both ends, described as being a useful weapon for inexperienced fighters to use. There is a single-sided version of this, known as the Golden Nick Dagger.
In LEGO Universe, a weapon known as the "Imagination Spinjitzu Double-Bladed Dagger" appears. It is identical to the Double-Bladed Dagger, but it allows the user to perform "Imagination Spinjitzu," a unique blue and white Spinjitzu tornado.
Twice the fun of a regular dagger, this handy weapon can attack danger from either side. It’s a great weapon for the new hero.[link unavailable]