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.
Rather than making a baddy impossible to hit, consider giving it mega-hit points.
Super hard to hit leads to great player frustration. Allowing them to do damage leads to a sense of accomplishment. another variation of this would be to give the bad guy a forcefield that shows damage.You could also give them a mastermind ability that sluffs the damage of to minions who should be easy to kill.Once in a while a super high to hit encounter is ok ,but it should be few and far between.
Your mileage may vary