A cursed and terrible relic
A cul-de-sac in arcanotechnology, the Singularity Plant is a power station that is more dangerous than it is valuable.
With but a name, these places fill common folk with apprehension and dread
Even the most despicable and evil Tyrant will be convinced they pale in comparison to this monstrosity.
“Swiftly, repent! The Saintmaker is coming!”
An otherwise simple spear, the dread blade of Hatred brings rot and decay to all it strikes, be it armour, body, or soul.
A glowing green stone flowing with the elemental power of evil
A standard book of evil.
A handsome bed set, obviously expensive and likely both old, and imported.
The creation of intelligent magical weapons is not an exact science and there are occasional failures, as such think of causing a little more stress to your players by "rewarding" them with an insane magical weapon
Agrophobic, refuses to come out of the scabbard without a strength check to draw it.
Haemaphobic: afraid of blood, fight at a penalty against any blooded creatures but really good against undead, elementals etc
Schizophrenic, not just one mind in your sword, lets have half a dozen minds in there, all different and bound to cause confusion
the possibilities are endless