Helm of Grallen
Originally found by Raistlin Majere inside Skullcap in Dragons of the Dwarven Depths by Weis and Hickman. Worn first by Sturm Brightblade, who became possessed by the spirit of Prince Grallen, a dwarven prince who died centuries before during the Dwarfgate Wars. Was later worn by Flint Fireforge before the Council of the Thanes in Thorbardin and was used to enter King Duncan's tomb. When placed on the stone statue of Grallen, whose tomb was empty, it turned to stone and became a part of the statue.
The Helm was also supposedly found around the same time by Chane Feldstone in The Gates of Thorbardin in the rubble of the Tower of Zhaman south of Skullcap and used to close the hidden entrance to Thorbardin. The Helm supposedly passed into the Dwarven realm after Chane returned to Thorbardin.
Read more about this topic: List Of Dragonlance Artifacts