Crystal Splinter

The Crystal Splinter is an artifact appearing in Ultima Underworld I

Description
It is given to the Avatar by Kallistan on the seventh level of the Abyss, after giving the password of Goldthirst: "Deco Morono". With the Splinter in possession, it is possible to enter the crypts, building shortcuts through the seventh level that make crossing it much easier. As Kallistan speculated, the evil lurking in the tombs probably had left it around to be found as a lure.