Hand of Narkul
Spoiler warning: Articles include story details through Episode 47 of the main campaign and all three episodes of Parental Advisory.
The Hand of Narkul is a severed limb of a semi-mythical entity associated with the Far Realm, according to Guthber. Ancient writings reportedly claimed it granted powers to its wielder.
Guthber says Otwic found it and attached it to his arm, after which it transformed him into a monstrous being. During the battle at Aelmor Monastery, an adventurer cut the Hand free. A rift opened, and the artifact is supposedly trapped in stasis between the Far Realm and the material plane.
Guthber and Helest are researching its history. The party does not see or obtain the Hand in Episode 1, and its current condition is not independently verified.