I'm looking at making an artifact of sorts that my group will gain access to that's not so much a good thing. The basic idea is that it's a sliver of a Dark Side jewel that looks almost like a coin. The problem is, the jewel is very powerful in the Dark Side and influences those that hold it, providing them with bad luck so long as it's in their possession. It also travels a lot and passes through several hands.
The Coin of Syldrick: According to old lore, the Coin of Syldrick is named so after the fallen Jedi named Gordin Syldrick. During his time in the order, he was corrupted by the Dark Side and offered a large, red jewel as payment to betray his friends among the Jedi. Accepting, the Jedi were all slain, leaving Syldrick with his prize. Feeling guilty, he attempted to return the jewel, but after being denied, he wanted to atone and attempted to bring the culprit's to justice. Instead, he was killed, during which, the stone was shattered into several coin-like discs that have since retained some of the evil force that tempted Syldrick in the first place.
Anyone that comes into possession of such a coin has all their difficulties upgraded by one until they can get rid of it. Alternatively, the coin amplifies anyone who's attuned to the Dark Side of The Force and grants them an upgrade to their abilities instead. Each of the red coins are fairly impervious to damage and always find their way into someone's possession. In the wrong hands, the coin could prove to be valuable and quite dangerous.
Constructive comments are more than welcome.