Arngrim is a berserker who wielded the legendary cursed sword Tyrfing.
Arngrim and the sword Tyrfing appear in Hervarar saga ok Heiðreks (The Saga of Hervör and Heidrek), a 13th century Icelandic saga. It was translated into English in 1960 by Christopher Tolkien, son of J.R.R Tolkien.
In one version of the saga, Arngrím is the leader of a band of raiders who attack Svafrlami's kingdom. The two men meet in battle, with Svafrlami wielding the sword Tyrfing. Svafrlami damages Arngrím's shield, but Arngrím cuts off Svafrlami's sword hand. Arngrím picks up Tyrfing and slays Svafrlami with it.