An item that puts a horible curse on the victims of its spell.
A dark emperors gloves that make an excelent weapon and torture tool.
Elementalist have commonly used jems to further their powers over nature.
Magic is the lifeforce of all living creatures, and it is from it that all life is made - in areas with lots of undead, magic might actually be missing or weak, which puts a whole new spin on how dangerous the undead are. Even simple zombies can be troublesome if you're relying on mages and you hit a pocket of undead making a low-magic zone...