Vasirr hired the ifreeti smith Jaro to create psychic daggers for him. He created the twin daggers called the Emerald Cutters for him.
Later on, after Vasirr and the Chimera defeated the dragon Qoraankul, he used the dragonbones to infuse the daggers further. The lizardfolk smith Father Druqitrozk enhanced the Emerald Cutters into the Dragonsteel Cutters.
simple melee weapon, 1d4 piercing, twin daggers, thrown (20/60), finesse, light, rare (requires attunement)
These twin steel daggers are magically amplified when used together, as they have a psychic link to you as well as to each other.
You gain a +1 to attack and damage rolls made with these magic weapons. When you hit the same target on your turn with each dagger, that target takes another 1d4 psychic damage.
Psychic Link. When you make a thrown weapon attack with either of the daggers, immediately after the attack the weapons fly back to your hand. If you do not have a free hand, they land in an unoccupied space within 5 feet of you.
Weapon (Daggers), Very Rare (Requires Attunement)
These twin dragonsteel daggers are magically amplified when used together. They contain the essence of a blue dragon, and heed your commands with a psionic link. You attune to both of the daggers together, and the daggers cannot be separated from each other beyond 120 feet. They count as separate weapons for the purpose of dual wielding.
You gain a +2 bonus to attack and damage rolls made with these magic weapons. On a hit, the weapons deal an additional 1d6 Lightning damage.
Returning. Immediately after hitting or missing with a ranged attack with these weapons, the weapons fly back to your hand. If you do not have a free hand, they land in an unoccupied space within 5 feet of you.