Orcrist was the sword of the leader of Durin's folk, Thorin. It had a fancy scabbard and a jeweled hilt. Thorin obtained the weapon when he and his company searched the trolls' cave early in the quest of Erebor.[1]
Goblins called the blade Biter.It had been crafted by the Elves, who not only made it a valuable weapon, but also a feared one, particularly among traditional enemies of the Elves: Orcs and other evil creatures of Middle-earth.[3] Like Glamdring and Sting, the blade could detect the presence of Orcs and warn its bearer by glowing blue.
Thorin was mortally wounded at the Battle of Five Armies. After his death Orcrist was placed upon Thorin's tomb and it "gleamed ever in the dark if foes approached".