Midnight at the Oasis
Arrow of Heironeous
A metallic arrow. It was prophesied that this would be a weapon that the sorceror-kings would come to fear. The party found it in the lost city of Samarthia, where they learned it was created by the psion Heironeous and that whoever held it controlled the entire demiplane. The party retrieved it and returned to Athas, although they were unsure how to use it.
Research in Kalak‘s library in Tyr turned up a volume about Heironeous and Hextor. The Arrow has the power to “give someone a second chance” and "erase the crimes they’ve committed," at the cost of someone else’s life.