You've discovered a letter in the ruined campsite where you found your mangled Thorn. The sender purports to be the legendary Shin Malphur, a supposed do-gooder with a complex approach to doing good. He claims he's entrusting you with the original Thorn, a hateful weapon capable of permanently killing Guardians. The gun is hidden away somewhere, and to find it, you'll have to use an enclosed system positioning device to track it down. Your Ghost observes that the signal changes once an hour, on the hour, so you'll have to be quick. Identify the location of the original Thorn using your system positioning device.