I'm not sure if my items really fit exactly the sort of thing you're looking for, but I need a place to write gadgets down for my setting.
The Necrotronic Instigator is the basic tool of necromantic magic, along with the Five Puissant Incantations of r'Amz, which are the first magical charms which every necromancer or sciologist learns.
The Instigator is, simply put, a tool for raising the dead. When applied to a corpse which still has flesh (a fleshless corpse does not have enough leftover lifeforce for the Instigator to work with, and requires a stronger tool) in conjunction with the correct Incantation of r'Amz, it instigates said corpse to rise up in obedience to the necromancer, powered by a necrotronic charge.
In appearance, the Instigator resembles a strange sort of pistol, with a handle (generally of bone or cold iron), a thin, curved trigger, a bulbous body with many tubes and chambers, and, rather than a barrel, a long, curved, talon-like spike. The basic component of an Instigator is a small iron bulb, filled with a sciochemical brew. In the center of the bulb, a catalyst is placed- generally, this catalyst is an object which naturally holds a necromantic charge, such as dried blood, a shred of funeral wrappings, gas from a corpse, or a fingerbone from an individual fitting certain characteristics (only a sciologist would know the necessary characteristics). When primary fuels (such as fresh blood, bile, or screams compressed into a liquid) and secondary fuels (magnesium powder, as well as such materals ground coal-dust, copper dust, or iron shavings) are packed into the chambers on the Instigator's body, the hammer is pulled back, and the Incantation of r'Amz is spoken, the device is ready to fire. The necromancer stabs the talon-spike of the Instigator into the corpse and pulls the trigger. The hammer slams down onto the secondary fuels, igniting them. The explosion triggers the primary fuels, which are evaporated away into a necrotronic charge; this charge is transferred into the bulb, and thence through the sciochemical liquid within, causing the catalyst to sublime away into pure necromantic energy, which is forced by the boiling chemicals through the spike at high speeds into the corpse.
If all has functioned correctly, the necrotronic charge, acting in concert with the free necrotrons in the air (released by the Incantations of r'Amz), will cause the corpse to rise up in a grisly parody of life, ready to recieve and carry out the orders of the necromancer or sciologist for a period of up to 3 weeks, at which point, by virtue of the accelerating properties of magical residue, it rapidly completes the cycle of decay and is generally quickly disposed of.