With Great Power Come Great Pain

 The magic items below are not 'cursed'.  They are extremely powerful items with major drawbacks. No price has been given because the artifacts value depends on the frequency magic items show up in the campaign, and on the power the artifacts give. 

While presented as rare, one of a kind items, nothing requires them to be unique, or even special. Massed produced wandering arrows are game changing but add a great deal of flavor to a setting-- and change the way combat works.

Soul Gem Magic

Amber Soul magic is a divisive form of magic. Capable of capturing an imprint of a person, those exposed to it disagree on the morality of doing so. Some maintain that capturing a soul upon death preserves the soul forever, granting the subject an afterlife and saving them from oblivion. Others claim that manipulating the souls damages the most eternal part of a person, and view taking the imprints as slavery, grave desecration, and black magic. And then there are those who don't care who right or wrong the power is, but only how useful.

Crawler

Crawlers are long aliens with many short limbs. Their main body is extremely flexible. They like different working conditions than humans, and so they are much more likely to meet virtually than actually. While they have been described as looking like centipedes, they have large reptilian scales on their main body and their claws are bony rather than chitinous. Their internal skeleton is quite strong. The great exception to their otherwise quite vertebrate build are their four mandibles, which they use in conjunction with a mass of feelers under their head to manipulate objects.