Dark Sun - Destiny and sacrifice
Crystal puchik dagger
Punch dagger made from psionic crystal
At first glance, they seem to be a pair of blue crystal rods as long as a hand is wide, but when one of the rods is squeezed with the hand, the crystal grows at both ends to surround the hand at the back and they become puchiks; or punching daggers. They immediately return to their ‘crystal rod’ shape when the pressure on them is let go.
Pox got his pair from a dead mul, former member of house Tanixu.
The construction of such kind of weapons is currently unknown to the PCs.