Death Blade

A Death Blade is a weapon exclusively available for use by Necromancers that choose to pursue Weapon Meistering as a secondary discipline, they are known to take many shapes, regardless of whether they have an actual blade or not.

History
The first Death Blade, weilded by the first Necromancer, was a set of claws. It isn't known completely how or why they were created, but it is assumed by historians that he simply wished for a more painful way to harm people.

The second Necromancer, upon deciding on a weapons form, chose a simple katana, as he was much less of a psycopath than the first, and wished for an elegant weapon in order to command his army of Nattodesu that he used to spread his reign of death during the First Necromantic War in Russia. The third chose no form, and simply plated his arm in metal (as had the first) and imbued that with the energy of the blades, effectively making his own body a weapon.

The most recent Necromancer, the much more subdued and pacifistic Risa Shohisuru, didn't wish for a weapon until almost sixty years into his life as a Necromancer, so when he called upon it, it took the form of the simplest previous weapon, the katana.

Use
The Death Blade is summoned via a simple incantation, "I summon the Death Blade". Every Necromancer besides the first spoke this phrase in Japanese.

The energy surrounding the Death Blades is assumed to be pure death, taken directly from the heart of the Necromanteion on the eleventh layer of the Underworld. It is highly volatile, and responds to the emotion and direction of the Necromancer weilding it, therefor making it fatal to the touch (to humans, higher tier demons will be unaffected), or nothing more than a glowing aura around a perfectly ordinary blade.